linux-kernel - [PATCH 3.12 063/100] crypto: gcm - Filter out async ghash if necessary

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Message-Id: <8f848d77d4591447ca0e62744c730e111178384b.1471589700.git.jslaby@suse.cz>
Date:   Fri, 19 Aug 2016 09:11:02 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 063/100] crypto: gcm - Filter out async ghash if necessary

From: Herbert Xu <herbert@...dor.apana.org.au>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit b30bdfa86431afbafe15284a3ad5ac19b49b88e3 upstream.

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.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 crypto/gcm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/crypto/gcm.c b/crypto/gcm.c
index f0bd00b15f26..d2a0f7371cf0 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -716,7 +716,9 @@ static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
 
 	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 ERR_CAST(ghash_alg);
 
-- 
2.9.3