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[PATCH 4.4 103/117] crypto: algif_hash - wait for crypto_ahash_init() to complete

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

------------------

From: Wang, Rui Y <rui.y.wang@intel.com>

commit fe09786178f9df713a4b2dd6b93c0a722346bf5e upstream.

hash_sendmsg/sendpage() need to wait for the completion
of crypto_ahash_init() otherwise it can cause panic.

Signed-off-by: Rui Wang <rui.y.wang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 crypto/algif_hash.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -54,7 +54,8 @@ static int hash_sendmsg(struct socket *s
 
 	lock_sock(sk);
 	if (!ctx->more) {
-		err = crypto_ahash_init(&ctx->req);
+		err = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
+						&ctx->completion);
 		if (err)
 			goto unlock;
 	}
@@ -125,6 +126,7 @@ static ssize_t hash_sendpage(struct sock
 	} else {
 		if (!ctx->more) {
 			err = crypto_ahash_init(&ctx->req);
+			err = af_alg_wait_for_completion(err, &ctx->completion);
 			if (err)
 				goto unlock;
 		}

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[PATCH 4.4 103/117] crypto: algif_hash - wait for crypto_ahash_init() to complete Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-02-14 23:40 +0100

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