crypto: arch - use crypto_memneq instead of memcmp

Replace remaining occurences (just as we did in crypto/) under arch/*/crypto/
that make use of memcmp() for comparing keys or authentication tags for
usage with crypto_memneq(). It can simply be used as a drop-in replacement
for the normal memcmp().
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: James Yonan <james@openvpn.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/s390/crypto/des_s390.c

@@ -237,8 +237,8 @@ static int des3_setkey(struct crypto_tfm *tfm, const u8 *key,
 	struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
 	u32 *flags = &tfm->crt_flags;
 
-	if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
-	    memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
+	if (!(crypto_memneq(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
+	    crypto_memneq(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
 			  DES_KEY_SIZE)) &&
 	    (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
 		*flags |= CRYPTO_TFM_RES_WEAK_KEY;

arch/x86/crypto/aesni-intel_glue.c

@@ -1001,7 +1001,7 @@ static int __driver_rfc4106_decrypt(struct aead_request *req)
 		authTag, auth_tag_len);
 
 	/* Compare generated tag with passed in tag. */
-	retval = memcmp(src + tempCipherLen, authTag, auth_tag_len) ?
+	retval = crypto_memneq(src + tempCipherLen, authTag, auth_tag_len) ?
 		-EBADMSG : 0;
 
 	if (one_entry_in_sg) {