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-rw-r--r--src/lib/crypt_ops/crypto_openssl_mgt.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/lib/crypt_ops/crypto_openssl_mgt.c b/src/lib/crypt_ops/crypto_openssl_mgt.c
index c97815f9a4..a245ef3810 100644
--- a/src/lib/crypt_ops/crypto_openssl_mgt.c
+++ b/src/lib/crypt_ops/crypto_openssl_mgt.c
@@ -176,6 +176,10 @@ crypto_openssl_free_all(void)
tor_free(crypto_openssl_version_str);
tor_free(crypto_openssl_header_version_str);
+ /* Destroying a locked mutex is undefined behaviour. This mutex may be
+ * locked, because multiple threads can access it. But we need to destroy
+ * it, otherwise re-initialisation will trigger undefined behaviour.
+ * See #31735 for details. */
#ifndef NEW_THREAD_API
if (n_openssl_mutexes_) {
int n = n_openssl_mutexes_;