Merge pull request wolfSSL#9922 from Frauschi/f-450

Fix memory leak in error case within RsaMGF1

Author: douzzer

wolfcrypt/src/rsa.c

@@ -985,6 +985,10 @@ static int RsaMGF1(enum wc_HashType hType, byte* seed, word32 seedSz,
 #endif
         if (ret != 0) {
             /* check for if dynamic memory was needed, then free */
+#ifdef WOLFSSL_SMALL_STACK_CACHE
+            wc_HashFree(hash, hType);
+            XFREE(hash, heap, DYNAMIC_TYPE_DIGEST);
+#endif
 #if defined(WOLFSSL_SMALL_STACK) && !defined(WOLFSSL_NO_MALLOC)
             if (tmpF) {
                 XFREE(tmp, heap, DYNAMIC_TYPE_RSA_BUFFER);