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<a href="https://gitlab.com/rockdaboot">Tim Rühsen</a> created an issue:
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<p dir="auto">Running the commands in <a href="https://gitlab.com/gnutls/gnutls/merge_requests/1136" data-original="!1136" data-link="false" data-link-reference="false" data-project="179611" data-merge-request="45503747" data-project-path="gnutls/gnutls" data-iid="1136" data-mr-title="UB+ASAN: Fail tests if UB detected" data-reference-type="merge_request" data-container="body" data-placement="bottom" title="" class="gfm gfm-merge_request">!1136</a> for the runner <code>UB+ASAN-Werror.Fedora.x86_64.gcc</code> stop with the error/backtrace below.</p>
<p dir="auto"><em>If</em> memcpy checks for NULL, nothing would happen. But if not, we would see a segmentation fault.</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">tim@ryzen:~/src/gnutls$ cat tests/slow/test-ciphers.sh.log </span>
<span id="LC2" class="line" lang="plaintext">iov.c:119:3: runtime error: null pointer passed as argument 2, which is declared to never be null</span>
<span id="LC3" class="line" lang="plaintext"> #0 0x7f99d24b1f5b in _gnutls_iov_iter_next /home/tim/src/gnutls/lib/iov.c:119</span>
<span id="LC4" class="line" lang="plaintext"> #1 0x7f99d2469482 in gnutls_aead_cipher_encryptv /home/tim/src/gnutls/lib/crypto-api.c:1043</span>
<span id="LC5" class="line" lang="plaintext"> #2 0x7f99d249995b in test_cipher_aead_scatter /home/tim/src/gnutls/lib/crypto-selftests.c:1028</span>
<span id="LC6" class="line" lang="plaintext"> #3 0x7f99d249995b in test_cipher_aead /home/tim/src/gnutls/lib/crypto-selftests.c:1292</span>
<span id="LC7" class="line" lang="plaintext"> #4 0x7f99d24a04d8 in gnutls_cipher_self_test /home/tim/src/gnutls/lib/crypto-selftests.c:1889</span>
<span id="LC8" class="line" lang="plaintext"> #5 0x555e1ea0e310 in main /home/tim/src/gnutls/tests/slow/cipher-test.c:45</span>
<span id="LC9" class="line" lang="plaintext"> #6 0x7f99d15aabba in __libc_start_main ../csu/libc-start.c:308</span>
<span id="LC10" class="line" lang="plaintext"> #7 0x555e1ea0e199 in _start (/home/tim/src/gnutls/tests/slow/cipher-test+0x1199)</span>
<span id="LC11" class="line" lang="plaintext"></span>
<span id="LC12" class="line" lang="plaintext">default cipher tests failed</span>
<span id="LC13" class="line" lang="plaintext">FAIL test-ciphers.sh (exit status: 1)</span>
<span id="LC14" class="line" lang="plaintext">tim@ryzen:~/src/gnutls$ cat tests/slow/override-ciphers.log </span>
<span id="LC15" class="line" lang="plaintext">iov.c:119:3: runtime error: null pointer passed as argument 2, which is declared to never be null</span>
<span id="LC16" class="line" lang="plaintext"> #0 0x7f574b5c3f5b in _gnutls_iov_iter_next /home/tim/src/gnutls/lib/iov.c:119</span>
<span id="LC17" class="line" lang="plaintext"> #1 0x7f574b57b482 in gnutls_aead_cipher_encryptv /home/tim/src/gnutls/lib/crypto-api.c:1043</span>
<span id="LC18" class="line" lang="plaintext"> #2 0x7f574b5ab95b in test_cipher_aead_scatter /home/tim/src/gnutls/lib/crypto-selftests.c:1028</span>
<span id="LC19" class="line" lang="plaintext"> #3 0x7f574b5ab95b in test_cipher_aead /home/tim/src/gnutls/lib/crypto-selftests.c:1292</span>
<span id="LC20" class="line" lang="plaintext"> #4 0x7f574b5b2501 in gnutls_cipher_self_test /home/tim/src/gnutls/lib/crypto-selftests.c:1892</span>
<span id="LC21" class="line" lang="plaintext"> #5 0x5583cd9f8c45 in main /home/tim/src/gnutls/tests/slow/cipher-override.c:228</span>
<span id="LC22" class="line" lang="plaintext"> #6 0x7f574a681bba in __libc_start_main ../csu/libc-start.c:308</span>
<span id="LC23" class="line" lang="plaintext"> #7 0x5583cd9f82e9 in _start (/home/tim/src/gnutls/tests/slow/.libs/cipher-override+0x32e9)</span>
<span id="LC24" class="line" lang="plaintext"></span>
<span id="LC25" class="line" lang="plaintext">overridden cipher tests failed</span>
<span id="LC26" class="line" lang="plaintext">FAIL override-ciphers (exit status: 1)</span></code></pre>
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