From: Wang, Rui Y <rui.y.wang@intel.com>
Date: Wed, 27 Jan 2016 09:08:37 +0000 (+0800)
Subject: crypto: algif_hash - wait for crypto_ahash_init() to complete
X-Git-Tag: firefly_0821_release~3391^2~17
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=792c6ff0d8ce1a3d1da9f7b657aa6a8017515216;p=firefly-linux-kernel-4.4.55.git

crypto: algif_hash - wait for crypto_ahash_init() to complete

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>
---

diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 608a7562839d..68a5ceaa04c8 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -54,7 +54,8 @@ static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
 
 	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 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;
 		}