crypto: api - Disallow identical driver names

commit 27016f75f5 upstream.

Disallow registration of two algorithms with identical driver names.

Cc: <stable@vger.kernel.org>
Reported-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

crypto/algapi.c

@@ -231,6 +231,7 @@ static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 		}
 
 		if (!strcmp(q->cra_driver_name, alg->cra_name) ||
+		    !strcmp(q->cra_driver_name, alg->cra_driver_name) ||
 		    !strcmp(q->cra_name, alg->cra_driver_name))
 			goto err;
 	}