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<a href="https://gitlab.com/juaristi">Ander Juaristi</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_544455288">lib/x509/x509_ext.c</a>:
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<pre style="margin: 0;">+<span id="LC3883" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_x509_decode_string</span><span class="p">(</span><span class="n" style="color: #333;">ASN1_ETYPE_OCTET_STRING</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC3884" class="line" lang="c"> <span class="n" style="color: #333;">ext</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">data</span><span class="p">,</span> <span class="n" style="color: #333;">ext</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">scts_content</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC3885" class="line" lang="c"> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC3886" 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>
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<pre style="margin: 0;">+<span id="LC3887" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">retval</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC3888" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC3889" 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;">_gnutls_read_uint16</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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<pre style="margin: 0;">+<span id="LC3890" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</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;">4</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC3891" 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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<pre style="margin: 0;">+<span id="LC3892" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC3893" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC3894" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC3895" 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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<pre style="margin: 0;">+<span id="LC3896" 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>
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<pre style="margin: 0;">+<span id="LC3897" 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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<pre style="margin: 0;">+<span id="LC3898" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">sct_length</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;">sct_length</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">length</span><span class="p">)</span></span>
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<p dir="auto">AFAIK <code>sct_length == 0</code> doesn't indicate end of data. You know you've reached EOD when you've read all the bytes that the length field said there are. While you're reading the SCTs, each SCT has its own length field, which is what we're reading here. And all of these should be greater than zero. AFAIK it is an error to have a zero length SCT.</p>
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