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Issue created by <a href="https://gitlab.com/Keryer">Kery</a>: <a href="https://gitlab.com/gnutls/gnutls/-/work_items/1899">#1899</a>
</p>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">This report was generated with AI assistance and manually verified.</p>
<h2 id="user-content-description-of-problem" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Description of problem:<a href="#description-of-problem" aria-label="Link to heading 'Description of problem:'" data-heading-content="Description of problem:" class="anchor" style="margin-top: 0px;"></a>
</h2>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The exported API <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>gnutls_hash_fast()</code> can dispatch to the x86 SSSE3 hash backend with <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>ptext == NULL</code> and <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>ptext_len > 0</code>. The internal backend <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>wrap_x86_hash_fast()</code> forwards the unchecked input pointer to <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>ctx.update()</code>, causing a NULL pointer read in the SHA-256 block routine.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The harness calls the exported <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>gnutls_hash_fast()</code> API. It does not directly call the internal static function.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">Affected code:</p>
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<pre data-canonical-lang="text" class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0px;">lib/accelerated/x86/sha-x86-ssse3.c:357 ctx.update(&ctx, text_size, text)</span>
<span id="LC2" class="line" lang="plaintext">lib/hash_int.c:153 _gnutls_hash_fast(...)</span>
<span id="LC3" class="line" lang="plaintext">lib/crypto-api.c:998 gnutls_hash_fast(...)</span></code></pre>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">This is a negative-argument API robustness issue: the reproducer passes <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>NULL + nonzero input length</code>.</p>
<h2 id="user-content-version-of-gnutls-used" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Version of gnutls used:<a href="#version-of-gnutls-used" aria-label="Link to heading 'Version of gnutls used:'" data-heading-content="Version of gnutls used:" class="anchor" style="margin-top: 0px;"></a>
</h2>
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<pre data-canonical-lang="text" class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0px;">Upstream origin/master</span>
<span id="LC2" class="line" lang="plaintext">Commit: 0b9fcb47c734191695b7b7812a0ba30a5c712b9f</span>
<span id="LC3" class="line" lang="plaintext">Commit date: 2026-06-02 10:05:44 +0900</span>
<span id="LC4" class="line" lang="plaintext">Configure summary version: 3.8.13 shared 72:0:42</span></code></pre>
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<h2 id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)<a href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel" aria-label="Link to heading 'Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)'" data-heading-content="Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)" class="anchor" style="margin-top: 0px;"></a>
</h2>
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<pre data-canonical-lang="text" class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0px;">Upstream source build, not a distribution package.</span>
<span id="LC2" class="line" lang="plaintext">Built locally on Ubuntu with glibc 2.39.</span></code></pre>
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<h2 id="user-content-how-reproducible" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">How reproducible:<a href="#how-reproducible" aria-label="Link to heading 'How reproducible:'" data-heading-content="How reproducible:" class="anchor" style="margin-top: 0px;"></a>
</h2>
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<pre data-canonical-lang="text" class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0px;">Always reproducible with the harness when GNUTLS_CPUID_OVERRIDE=0x4 is used to select the x86 SSSE3 backend.</span></code></pre>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">Steps to Reproduce:</p>
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<li style="margin-top: 0px; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Build GnuTLS from the commit above with hardening and sanitizers:</li>
</ul>
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<pre data-canonical-lang="text" class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0px;">CPPFLAGS=-D_FORTIFY_SOURCE=3</span>
<span id="LC2" class="line" lang="plaintext">CFLAGS=-O2 -g -fno-omit-frame-pointer -fsanitize=address,undefined -fstack-protector-strong -fPIE</span>
<span id="LC3" class="line" lang="plaintext">LDFLAGS=-fsanitize=address,undefined -Wl,-z,relro -Wl,-z,now -pie</span></code></pre>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The verified library was:</p>
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<pre data-canonical-lang="text" class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0px;"><build-dir>/lib/.libs/libgnutls.so.30.42.0</span>
<span id="LC2" class="line" lang="plaintext">SHA-256: 224c60682088ac07680c1eba04acd159b51bd8995bedcbc1fc288fe248a1058b</span></code></pre>
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<ul dir="auto" style="text-align: initial; list-style-type: disc; margin: 0px 0px 1rem; padding: 0;">
<li style="margin-top: 0px; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Compile the reproducer:</li>
</ul>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">Reproducer source: <a href="https://github.com/Bin-infinite/vuln-validations/blob/f47f650ccab29d5be069fe5418a8ae2a7ec23d51/gnutls/latest/%63%61%73%65%2D005/pocs/hash_fast_null_harness.c" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0px;">hash_fast_null_harness.c</a></p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The core call is:</p>
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<pre data-canonical-lang="c" class="code highlight js-syntax-highlight language-c" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="c" style="margin-top: 0px;"><span class="n" style="margin-top: 0px;">gnutls_hash_fast</span><span class="p">(</span><span class="n">GNUTLS_DIG_SHA256</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="mi">64</span><span class="p">,</span> <span class="n">digest</span><span class="p">);</span></span></code></pre>
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<li style="margin-top: 0px; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Run the reproducer:</li>
</ul>
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<pre data-canonical-lang="bash" class="code highlight js-syntax-highlight language-shell" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="shell" style="margin-top: 0px;"><span class="nv" style="margin-top: 0px;">ASAN_OPTIONS</span><span class="o">=</span><span class="s1">'abort_on_error=1:symbolize=1:detect_leaks=0:allocator_may_return_null=1'</span> <span class="se">\</span></span>
<span id="LC2" class="line" lang="shell"><span class="nv" style="margin-top: 0px;">UBSAN_OPTIONS</span><span class="o">=</span><span class="s1">'halt_on_error=0:print_stacktrace=1'</span> <span class="se">\</span></span>
<span id="LC3" class="line" lang="shell"><span class="nv" style="margin-top: 0px;">LSAN_OPTIONS</span><span class="o">=</span><span class="s1">'detect_leaks=0'</span> <span class="se">\</span></span>
<span id="LC4" class="line" lang="shell"><span class="nv" style="margin-top: 0px;">GNUTLS_CPUID_OVERRIDE</span><span class="o">=</span>0x4 <span class="se">\</span></span>
<span id="LC5" class="line" lang="shell">./hash_fast_null_harness</span></code></pre>
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<h2 id="user-content-actual-results" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Actual results:<a href="#actual-results" aria-label="Link to heading 'Actual results:'" data-heading-content="Actual results:" class="anchor" style="margin-top: 0px;"></a>
</h2>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">ASan reports a NULL read:</p>
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<pre data-canonical-lang="text" class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0px;">ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000</span>
<span id="LC2" class="line" lang="plaintext">The signal is caused by a READ memory access.</span>
<span id="LC3" class="line" lang="plaintext">#0 sha256_block_data_order_ssse3 lib/accelerated/x86/elf/sha256-ssse3-x86_64.s:2066</span>
<span id="LC4" class="line" lang="plaintext">#1 x86_sha256_update lib/accelerated/x86/sha-x86-ssse3.c:160</span>
<span id="LC5" class="line" lang="plaintext">#2 wrap_x86_hash_fast lib/accelerated/x86/sha-x86-ssse3.c:357</span>
<span id="LC6" class="line" lang="plaintext">#3 _gnutls_hash_fast lib/hash_int.c:153</span>
<span id="LC7" class="line" lang="plaintext">#4 gnutls_hash_fast lib/crypto-api.c:998</span>
<span id="LC8" class="line" lang="plaintext">#5 main hash_fast_null_harness.c:21</span></code></pre>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The same run also emits a UBSan function-pointer type diagnostic at the backend update call site before ASan reports the NULL read.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">Full log: <a href="https://github.com/Bin-infinite/vuln-validations/blob/f47f650ccab29d5be069fe5418a8ae2a7ec23d51/gnutls/latest/%63%61%73%65%2D005/runs/hash_null_text_run1.stderr.txt" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0px;">hash_null_text_run1.stderr.txt</a></p>
<h2 id="user-content-expected-results" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Expected results:<a href="#expected-results" aria-label="Link to heading 'Expected results:'" data-heading-content="Expected results:" class="anchor" style="margin-top: 0px;"></a>
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<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial"><code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>gnutls_hash_fast()</code> should reject <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>ptext == NULL && ptext_len > 0</code> with a negative error code, such as <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>GNUTLS_E_INVALID_REQUEST</code>, before invoking backend callbacks. <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>digest == NULL</code> should also be rejected or explicitly documented if unsupported.</p>
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