Don't cleanup uninitialized thread local slots

Fixes: #6120
Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
(Merged from https://github.com/openssl/openssl/pull/6123)

diff --git a/crypto/rand/drbg_lib.c b/crypto/rand/drbg_lib.c
index c6397b22c6d4e94bcbd88556699326168ab23776..60ddd2fe204b409a940663be9ca746fd9df8c9c7 100644 (file)
--- a/crypto/rand/drbg_lib.c
+++ b/crypto/rand/drbg_lib.c
@@ -912,11 +912,13 @@ err1:
 /* Clean up the global DRBGs before exit */
 void rand_drbg_cleanup_int(void)
 {
-    RAND_DRBG_free(master_drbg);
-    master_drbg = NULL;
+    if (master_drbg != NULL) {
+        RAND_DRBG_free(master_drbg);
+        master_drbg = NULL;
 
-    CRYPTO_THREAD_cleanup_local(&private_drbg);
-    CRYPTO_THREAD_cleanup_local(&public_drbg);
+        CRYPTO_THREAD_cleanup_local(&private_drbg);
+        CRYPTO_THREAD_cleanup_local(&public_drbg);
+    }
 }
 
 void drbg_delete_thread_state()