Fix bug #72140 (segfault after calling ERR_free_strings())

Author: bukka

NEWS

@@ -9,6 +9,10 @@ PHP                                                                        NEWS
   . Fixed bug #70484 (selectordinal doesn't work with named parameters).
     (Anatol)
 
+- OpenSSL:
+  . Fixed bug #72140 (segfault after calling ERR_free_strings()).
+    (Jakub Zelenka)
+
 26 May 2016, PHP 5.6.22
 
 - Core:

ext/openssl/openssl.c

@@ -1278,6 +1278,9 @@ PHP_MSHUTDOWN_FUNCTION(openssl)
 	EVP_cleanup();
 
 #if OPENSSL_VERSION_NUMBER >= 0x00090805f
+	/* prevent accessing locking callback from unloaded extension */
+	CRYPTO_set_locking_callback(NULL);
+	/* free allocated error strings */
 	ERR_free_strings();
 #endif