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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1399#note_525353833">lib/str.c</a>:
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">unlikely</span><span class="p">(</span><span class="n" style="color: #333;">dest</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">data</span> <span class="o" style="font-weight: 600;">!=</span> <span class="nb" style="color: #0086b3;">NULL</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">dest</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">allocd</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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<pre style="margin: 0;"> <span id="LC147" 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;">GNUTLS_E_INVALID_REQUEST</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* When running under valgrind, use a simpler logic for reallocation;</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * i.e., always call gnutls_realloc_fast() and do not reclaim the</span></span>
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * no-longer-used area which has been removed from the beginning of</span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * buffer with _gnutls_buffer_pop_datum().</span></span>
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<pre style="margin: 0;">+<span id="LC153" 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="LC154" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#ifdef HAVE_VALGRIND_MEMCHECK_H</span></span>
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<p dir="auto">Yes; that makes the issue happen more reliably.</p>
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