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<a href="https://gitlab.com/d.meliksetyan">David Meliksetyan</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1579">#1579</a>
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<a href="#potential-problem" aria-hidden="true" class="anchor" id="user-content-potential-problem" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Potential problem</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">By defining <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>p</code> in <strong style="font-weight: 600;">/lib/privkey.c</strong>, we dereference the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>privkey</code> pointer. <a href="https://gitlab.com/gnutls/gnutls/-/blob/3.8.3/lib/privkey.c#L1922">https://gitlab.com/gnutls/gnutls/-/blob/3.8.3/lib/privkey.c#L1922</a></p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">At the same time there is a check that <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>privkey</code> is not <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>NULL</code>, but it is located after the dereference. This carries the risk of null dereferencing. <a href="https://gitlab.com/gnutls/gnutls/-/blob/3.8.3/lib/privkey.c#L1924-1927">https://gitlab.com/gnutls/gnutls/-/blob/3.8.3/lib/privkey.c#L1924-1927</a></p>
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<a href="#possible-solution" aria-hidden="true" class="anchor" id="user-content-possible-solution" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Possible solution</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">If I correctly assumed this as a mistake, to fix it, it will be enough to replace the dereference line and the check in places.</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Found by Linux Verification Center (portal.linuxtesting.ru) with SVACE.</p>
<p dir="auto" style="color: #28272d; margin: 0;" align="initial">Author D. Meliksetyan.</p>
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