test/evp_test.c: Fixed strcmp() fault in mac_test_init()
When wanting to compare the end of a string with another string, make
sure not to start somewhere before the start of the first string.
[extended tests]
@@ -863,7 +863,8 @@ static int mac_test_init(EVP_TEST *t, const char *alg)
size_t sz = strlen(alg);
static const char epilogue[] = " by EVP_PKEY";
- if (strcmp(alg + sz - (sizeof(epilogue) - 1), epilogue) == 0)
+ if (sz >= sizeof(epilogue)
+ && strcmp(alg + sz - (sizeof(epilogue) - 1), epilogue) == 0)
sz -= sizeof(epilogue) - 1;
if (strncmp(alg, "HMAC", sz) == 0) {
