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crypto: gcm - Filter out async ghash if necessary

Message ID 20160615142705.GA18474@gondor.apana.org.au (mailing list archive)
State Accepted
Delegated to: Herbert Xu
Headers show

Commit Message

Herbert Xu June 15, 2016, 2:27 p.m. UTC 
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>
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Patch

diff --git a/crypto/gcm.c b/crypto/gcm.c
index bec329b..917b8fb 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);