Add a return value to hasher_t.allocate_hash()

src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c

@@ -235,11 +235,11 @@ static bool build_emsa_pkcs1_signature(private_gmp_rsa_private_key_t *this,
 		}
 
 		hasher = lib->crypto->create_hasher(lib->crypto, hash_algorithm);
-		if (hasher == NULL)
+		if (!hasher || !hasher->allocate_hash(hasher, data, &hash))
 		{
+			DESTROY_IF(hasher);
 			return FALSE;
 		}
-		hasher->allocate_hash(hasher, data, &hash);
 		hasher->destroy(hasher);
 
 		/* build DER-encoded digestInfo */

src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c

@@ -252,7 +252,11 @@ static bool verify_emsa_pkcs1_signature(private_gmp_rsa_public_key_t *this,
 					}
 
 					/* build our own hash and compare */
-					hasher->allocate_hash(hasher, data, &hash);
+					if (!hasher->allocate_hash(hasher, data, &hash))
+					{
+						hasher->destroy(hasher);
+						goto end_parser;
+					}
 					hasher->destroy(hasher);
 					success = memeq(object.ptr, hash.ptr, hash.len);
 					free(hash.ptr);