From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Wed, 15 Jun 2016 14:27:05 +0000 (+0800)
Subject: crypto: gcm - Filter out async ghash if necessary
X-Git-Tag: v4.8-rc1~165^2~129
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=b30bdfa86431afbafe15284a3ad5ac19b49b88e3;p=linux-2.6-block.git

crypto: gcm - Filter out async ghash if necessary

As it is if you ask for a sync gcm you may actually end up with
an async one because it does not filter out async implementations
of ghash.

This patch fixes this by adding the necessary filter when looking
for ghash.

Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/gcm.c b/crypto/gcm.c
index bec329b3de8d..d9ea5f9c0574 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -639,7 +639,9 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
 
 	ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
 				    CRYPTO_ALG_TYPE_HASH,
-				    CRYPTO_ALG_TYPE_AHASH_MASK);
+				    CRYPTO_ALG_TYPE_AHASH_MASK |
+				    crypto_requires_sync(algt->type,
+							 algt->mask));
 	if (IS_ERR(ghash_alg))
 		return PTR_ERR(ghash_alg);