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Merge request <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367">!1367</a> was reviewed by <a href="https://gitlab.com/dueno">Daiki Ueno</a>
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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965196">lib/x509/x509_ext.c</a>:
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3615
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<pre style="margin: 0;">+<span id="LC3615" class="line" lang="c"><span class="p">{</span></span>
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3616
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<pre style="margin: 0;">+<span id="LC3616" class="line" lang="c"> <span class="k" style="font-weight: 600;">switch</span> <span class="p">(</span><span class="n" style="color: #333;">sigalg</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC3617" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">GNUTLS_SIGN_RSA_MD5</span><span class="p">:</span></span>
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<p dir="auto">Is this code path performance critical? If not, I would suggest using a table (variable) instead of <code>switch</code>s in this function and <code>get_sigalg*</code>.</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965197">lib/x509/x509_ext.c</a>:
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<pre style="margin: 0;">+<span id="LC3699" class="line" lang="c"> <span class="n" style="color: #333;">memcpy</span><span class="p">(</span><span class="n" style="color: #333;">sct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">logid</span><span class="p">,</span> <span class="n" style="color: #333;">ptr</span><span class="p">,</span> <span class="n" style="color: #333;">SCT_V1_LOGID_SIZE</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC3700" class="line" lang="c"> <span class="n" style="color: #333;">ptr</span> <span class="o" style="font-weight: 600;">+=</span> <span class="n" style="color: #333;">SCT_V1_LOGID_SIZE</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC3701" class="line" lang="c"> <span class="n" style="color: #333;">length</span> <span class="o" style="font-weight: 600;">-=</span> <span class="n" style="color: #333;">SCT_V1_LOGID_SIZE</span><span class="p">;</span></span>
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<p dir="auto">Although I don't see any use of it under <code>lib/x509</code>, perhaps we could use <code>DECR_LENGTH_RET</code>?</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965198">lib/x509/x509_ext.c</a>:
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<pre style="margin: 0;">+<span id="LC3716" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Check that there are actually no extensions - the following two bytes should be zero.</span></span>
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<pre style="margin: 0;">+<span id="LC3717" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">+<span id="LC3718" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">ptr</span> <span class="o" style="font-weight: 600;">!=</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">||</span> <span class="o" style="font-weight: 600;">*</span><span class="p">(</span><span class="n" style="color: #333;">ptr</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<p dir="auto">Shouldn't we check <code>length >= 2</code> before dereferencing <code>ptr</code> and <code>ptr + 1</code>?</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965200">lib/x509/x509_ext.c</a>:
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<pre style="margin: 0;">+<span id="LC3741" class="line" lang="c"> <span class="n" style="color: #333;">length</span> <span class="o" style="font-weight: 600;">-=</span> <span class="mi" style="color: #099;">2</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC3742" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC3743" class="line" lang="c"> <span class="n" style="color: #333;">sct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sigalg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_sigalg</span><span class="p">(</span><span class="n" style="color: #333;">hash_algo</span><span class="p">,</span> <span class="n" style="color: #333;">sig_algo</span><span class="p">);</span></span>
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<p dir="auto"><code>get_sigalg</code> can return an error code outside of the <code>gnutls_signature_algorithm_t</code> enum range, so I suspect some static analyzers would complain this part. I suggest rewriting this to:</p>
<pre class="code highlight js-syntax-highlight c" lang="c" v-pre="true" style="background-color: #fff; font-family: monospace; font-size: 90%; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; color: #998; font-style: italic; margin: 0;"><code><span id="LC1" class="line" lang="c"><span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_sigalg</span><span class="p">(</span><span class="n" style="color: #333;">hash_algo</span><span class="p">,</span> <span class="n" style="color: #333;">sig_algo</span><span class="p">);</span></span>
<span id="LC2" class="line" lang="c"><span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC3" class="line" lang="c"> <span class="k" style="font-weight: 600;">goto</span> <span class="n" style="color: #333;">cleanup</span><span class="p">;</span></span>
<span id="LC4" class="line" lang="c"><span class="p">}</span></span>
<span id="LC5" class="line" lang="c"><span class="n" style="color: #333;">sct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sigalg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span></code></pre>
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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965202">lib/x509/x509_ext.c</a>:
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<pre style="margin: 0;">+<span id="LC3749" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC3750" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Signature, length and content */</span></span>
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<pre style="margin: 0;">+<span id="LC3751" class="line" lang="c"> <span class="n" style="color: #333;">sig_length</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_read_uint16</span><span class="p">(</span><span class="n" style="color: #333;">ptr</span><span class="p">);</span></span>
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<p dir="auto">Missing <code>length >= 2</code> check before accessing <code>ptr</code>?</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965203">lib/x509/x509_ext.c</a>:
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<pre style="margin: 0;">+<span id="LC3788" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">ct_sct_st</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">new_scts</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC3789" class="line" lang="c"></span>
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3790
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<pre style="margin: 0;">+<span id="LC3790" class="line" lang="c"> <span class="n" style="color: #333;">new_scts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gnutls_realloc</span><span class="p">(</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">scts</span><span class="p">,</span> <span class="p">(</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">*</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">ct_sct_st</span><span class="p">));</span></span>
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<p dir="auto">Missing overflow check in multiplication (see <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1392" data-original="!1392" data-link="false" data-link-reference="false" data-project="179611" data-merge-request="89313941" data-project-path="gnutls/gnutls" data-iid="1392" data-mr-title="build: avoid potential integer overflow in array allocation" data-reference-type="merge_request" data-container="body" data-placement="top" title="" class="gfm gfm-merge_request">!1392</a>).</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965207">lib/x509/x509_ext.c</a>:
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3799
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<pre style="margin: 0;">+<span id="LC3799" class="line" lang="c"><span class="p">}</span></span>
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3800
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<pre style="margin: 0;">+<span id="LC3800" class="line" lang="c"></span>
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3801
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<pre style="margin: 0;">+<span id="LC3801" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="nf" style="color: #900; font-weight: 600;">_gnutls_export_ct_v1_sct</span><span class="p">(</span><span class="k" style="font-weight: 600;">const</span> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">ct_sct_st</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">sct</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">base_size</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">out</span><span class="p">)</span></span>
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<p dir="auto">Can we assume that <code>out</code> always has enough room for writing? If so, you could add a comment why we can omit bounds-check in this function.</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965209">lib/x509/x509_ext.c</a>:
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3871
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<pre style="margin: 0;">+<span id="LC3871" class="line" lang="c"> <span class="n" style="color: #333;">ptr</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">scts_content</span><span class="p">.</span><span class="n" style="color: #333;">data</span><span class="p">[</span><span class="mi" style="color: #099;">2</span><span class="p">];</span></span>
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3872
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<pre style="margin: 0;">+<span id="LC3872" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
</pre>
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3873
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<pre style="margin: 0;">+<span id="LC3873" class="line" lang="c"> <span class="n" style="color: #333;">sct_length</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_read_uint16</span><span class="p">(</span><span class="n" style="color: #333;">ptr</span><span class="p">);</span></span>
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<p dir="auto">Missing <code>length >= 2</code> check?</p>
</div>
<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965210">lib/x509/x509_ext.c</a>:
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3887
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<pre style="margin: 0;">+<span id="LC3887" class="line" lang="c"> <span class="p">}</span></span>
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3888
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<pre style="margin: 0;">+<span id="LC3888" class="line" lang="c"></span>
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3889
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<pre style="margin: 0;">+<span id="LC3889" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_free</span><span class="p">(</span><span class="n" style="color: #333;">scts_content</span><span class="p">.</span><span class="n" style="color: #333;">data</span><span class="p">);</span></span>
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<p dir="auto">nit: <code>_gnutls_free_datum(&scts_content)</code>.</p>
</div>
<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965211">lib/x509/x509_ext.c</a>:
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3477
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<pre style="margin: 0;">+<span id="LC3477" class="line" lang="c"><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">gnutls_x509_ct_scts_st</span> <span class="p">{</span></span>
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3478
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<pre style="margin: 0;">+<span id="LC3478" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">ct_sct_st</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">scts</span><span class="p">;</span></span>
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3479
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<pre style="margin: 0;">+<span id="LC3479" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">size</span><span class="p">;</span></span>
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<p dir="auto">I suggest using <code>size_t</code> everywhere for sizes, unless there is a good reason.</p>
</div>
<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965212">lib/x509/x509_ext.c</a>:
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3951
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<pre style="margin: 0;">+<span id="LC3951" class="line" lang="c"></span>
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3952
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<pre style="margin: 0;">+<span id="LC3952" class="line" lang="c"><span class="nl">cleanup:</span></span>
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3953
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<pre style="margin: 0;">+<span id="LC3953" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">out</span><span class="p">)</span></span>
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<p dir="auto">No need for this <code>if</code>, if you initialize out as NULL.</p>
</div>
<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965213">lib/x509/x509_ext.c</a>:
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3970
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<pre style="margin: 0;">+<span id="LC3970" class="line" lang="c"> <span class="n" style="color: #333;">version</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scts</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">scts</span><span class="p">[</span><span class="n" style="color: #333;">idx</span><span class="p">].</span><span class="n" style="color: #333;">version</span><span class="p">;</span></span>
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3971
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<pre style="margin: 0;">+<span id="LC3971" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">version</span> <span class="o" style="font-weight: 600;">!=</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">version_out</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span></span>
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3972
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<pre style="margin: 0;">+<span id="LC3972" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">;</span></span>
</pre>
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<div style="border-bottom-width: 1px; border-bottom-color: #ededed; border-bottom-style: solid;">
<p dir="auto">No predefined error code?</p>
</div>
<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965214">lib/x509/x509_ext.c</a>:
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<td class="new_line diff-line-num new" data-linenumber="3990" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
3990
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<pre style="margin: 0;">+<span id="LC3990" class="line" lang="c"> <span class="n" style="color: #333;">sct</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">scts</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">scts</span><span class="p">[</span><span class="n" style="color: #333;">idx</span><span class="p">];</span></span>
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3991
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<pre style="margin: 0;">+<span id="LC3991" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">sct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">version</span> <span class="o" style="font-weight: 600;">!=</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span></span>
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3992
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<pre style="margin: 0;">+<span id="LC3992" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">;</span></span>
</pre>
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<div style="border-bottom-width: 1px; border-bottom-color: #ededed; border-bottom-style: solid;">
<p dir="auto">No predefined error code?</p>
</div>
<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965215">lib/x509/x509_ext.c</a>:
</p>
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3995
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<pre style="margin: 0;">+<span id="LC3995" class="line" lang="c"> <span class="n" style="color: #333;">sct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">signature</span><span class="p">.</span><span class="n" style="color: #333;">data</span><span class="p">,</span></span>
</pre>
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3996
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<pre style="margin: 0;">+<span id="LC3996" class="line" lang="c"> <span class="n" style="color: #333;">sct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">signature</span><span class="p">.</span><span class="n" style="color: #333;">size</span><span class="p">);</span></span>
</pre>
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3997
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<pre style="margin: 0;">+<span id="LC3997" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">retval</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span></span>
</pre>
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<p dir="auto">nit: what about moving this check inside the <code>if (signature) { ... }</code> block?</p>
</div>
<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965216">lib/x509/x509_ext.c</a>:
</p>
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4001
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<pre style="margin: 0;">+<span id="LC4001" class="line" lang="c"> <span class="n" style="color: #333;">sct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">logid</span><span class="p">,</span></span>
</pre>
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4002
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<pre style="margin: 0;">+<span id="LC4002" class="line" lang="c"> <span class="n" style="color: #333;">SCT_V1_LOGID_SIZE</span><span class="p">);</span></span>
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4003
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<pre style="margin: 0;">+<span id="LC4003" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">retval</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<p dir="auto">nit: what about moving this check inside the if (logid) { ... } block?</p>
</div>
<p style="color: #777777;">
<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_533965217">lib/x509/x509_ext.c</a>:
</p>
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4006
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<pre style="margin: 0;">+<span id="LC4006" class="line" lang="c"> <span class="p">}</span></span>
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4007
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<pre style="margin: 0;">+<span id="LC4007" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">timestamp</span><span class="p">)</span></span>
</pre>
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4008
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<pre style="margin: 0;">+<span id="LC4008" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">timestamp</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">sct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">timestamp</span> <span class="o" style="font-weight: 600;">/</span> <span class="mi" style="color: #099;">1000</span><span class="p">);</span></span>
</pre>
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<p dir="auto">nit: no need for parentheses in RHS.</p>
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