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<a href="https://gitlab.com/karlson2k">Evgeny Grin</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1377#note_509556996">lib/system/sockets.c</a>:
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">ssize_t</span></span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">system_writev</span><span class="p">(</span><span class="n" style="color: #333;">gnutls_transport_ptr_t</span> <span class="n" style="color: #333;">ptr</span><span class="p">,</span> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">giovec_t</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">iovec</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">iovec_cnt</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="c"> <span class="n" style="color: #333;">WSABUF</span> <span class="n" style="color: #333;">bufs</span><span class="p">[</span><span class="n" style="color: #333;">iovec_cnt</span><span class="p">];</span></span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="c"> <span class="n" style="color: #333;">DWORD</span> <span class="n" style="color: #333;">bytes_sent</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">to_send_cnt</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">to_send_bytes</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="LC91" class="line" lang="c"> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">ovrflwn</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">false</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">to_send_cnt</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">to_send_cnt</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">iovec_cnt</span> <span class="o" style="font-weight: 600;">&&</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">ovrflwn</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="c"> <span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333;">to_send_cnt</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">to_send_bytes</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">iovec</span><span class="p">[</span><span class="n" style="color: #333;">to_send_cnt</span><span class="p">].</span><span class="n" style="color: #333;">iov_len</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">SSIZE_MAX</span> <span class="o" style="font-weight: 600;">||</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="c"> <span class="n" style="color: #333;">iovec</span><span class="p">[</span><span class="n" style="color: #333;">to_send_cnt</span><span class="p">].</span><span class="n" style="color: #333;">iov_len</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">SSIZE_MAX</span><span class="p">)</span> <span class="p">{</span></span>
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<p dir="auto">As per GnuTLS guidelines, I'm trying to avoid comments in code. :)</p>
<p dir="auto">If <code>iovec[to_send_cnt].iov_len</code> is large enough (close to 2x<code>SSIZE_MAX</code>) then sum of (something + large enough) can warp (overflow) to number less then <code>SSIZE_MAX</code>.</p>
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