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diff --git a/src/lib/crypto/OSSLCryptoFactory.cpp b/src/lib/crypto/OSSLCryptoFactory.cpp
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index 32daca2..ace4bcb 100644
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--- a/src/lib/crypto/OSSLCryptoFactory.cpp
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+++ b/src/lib/crypto/OSSLCryptoFactory.cpp
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@@ -226,31 +226,49 @@ err:
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// Destructor
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OSSLCryptoFactory::~OSSLCryptoFactory()
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{
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-#ifdef WITH_GOST
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- // Finish the GOST engine
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- if (eg != NULL)
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+ bool ossl_shutdown = false;
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+
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+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
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+ // OpenSSL 1.1.0+ will register an atexit() handler to run
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+ // OPENSSL_cleanup(). If that has already happened we must
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+ // not attempt to free any ENGINEs because they'll already
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+ // have been destroyed and the use-after-free would cause
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+ // a deadlock or crash.
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+ //
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+ // Detect that situation because reinitialisation will fail
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+ // after OPENSSL_cleanup() has run.
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+ (void)ERR_set_mark();
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+ ossl_shutdown = !OPENSSL_init_crypto(OPENSSL_INIT_ENGINE_RDRAND, NULL);
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+ (void)ERR_pop_to_mark();
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+#endif
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+ if (!ossl_shutdown)
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{
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- ENGINE_finish(eg);
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- ENGINE_free(eg);
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- eg = NULL;
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- }
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+#ifdef WITH_GOST
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+ // Finish the GOST engine
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+ if (eg != NULL)
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+ {
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+ ENGINE_finish(eg);
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+ ENGINE_free(eg);
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+ eg = NULL;
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+ }
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#endif
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- // Finish the rd_rand engine
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- ENGINE_finish(rdrand_engine);
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- ENGINE_free(rdrand_engine);
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- rdrand_engine = NULL;
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+ // Finish the rd_rand engine
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+ ENGINE_finish(rdrand_engine);
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+ ENGINE_free(rdrand_engine);
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+ rdrand_engine = NULL;
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+ // Recycle locks
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+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
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+ if (setLockingCallback)
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+ {
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+ CRYPTO_set_locking_callback(NULL);
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+ }
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+#endif
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+ }
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// Destroy the one-and-only RNG
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delete rng;
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- // Recycle locks
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-#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
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- if (setLockingCallback)
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- {
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- CRYPTO_set_locking_callback(NULL);
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- }
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-#endif
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for (unsigned i = 0; i < nlocks; i++)
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{
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MutexFactory::i()->recycleMutex(locks[i]);
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