linux-kernel - [PATCH 3.16.y-ckt 064/129] crypto: algif_hash - wait for crypto_ahash

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Date:	Fri, 26 Feb 2016 10:20:35 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Rui Wang <rui.y.wang@...el.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 064/129] crypto: algif_hash - wait for crypto_ahash_init() to complete

3.16.7-ckt25 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: "Wang, Rui Y" <rui.y.wang@...el.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@...el.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 crypto/algif_hash.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 2dfb0f10e0bb..d11d431251f7 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -56,7 +56,8 @@ static int hash_sendmsg(struct kiocb *unused, struct socket *sock,
 
 	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;
 	}
@@ -136,6 +137,7 @@ static ssize_t hash_sendpage(struct socket *sock, struct page *page,
 	} else {
 		if (!ctx->more) {
 			err = crypto_ahash_init(&ctx->req);
+			err = af_alg_wait_for_completion(err, &ctx->completion);
 			if (err)
 				goto unlock;
 		}