[4.2.y-ckt stable] Patch "crypto: algif_skcipher - Do not set MAY_BACKLOG on the async path" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    crypto: algif_skcipher - Do not set MAY_BACKLOG on the async path

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt5.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

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

>From 2ee8bfa60919a6a33cd91cb1e592c0bb3221a1bf Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert at gondor.apana.org.au>
Date: Wed, 3 Feb 2016 21:39:27 +0800
Subject: crypto: algif_skcipher - Do not set MAY_BACKLOG on the async path

commit dad41997063723eaf5f77bc2015606a5a9bce320 upstream.

The async path cannot use MAY_BACKLOG because it is not meant to
block, which is what MAY_BACKLOG does.  On the other hand, both
the sync and async paths can make use of MAY_SLEEP.

Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
[ kamal: backport to 4.2-stable: context ]
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 crypto/algif_skcipher.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index 9565568..6c0410e 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -538,7 +538,7 @@ static int skcipher_recvmsg_async(struct socket *sock, struct msghdr *msg,
 	sg_init_table(sreq->tsg, tx_nents);
 	memcpy(sreq->iv, ctx->iv, GET_IV_SIZE(ctx));
 	ablkcipher_request_set_tfm(req, crypto_ablkcipher_reqtfm(&ctx->req));
-	ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+	ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
 					skcipher_async_cb, sk);

 	while (iov_iter_count(&msg->msg_iter)) {
@@ -948,7 +948,8 @@ static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
 	ask->private = ctx;

 	ablkcipher_request_set_tfm(&ctx->req, skcipher);
-	ablkcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+	ablkcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_SLEEP |
+						   CRYPTO_TFM_REQ_MAY_BACKLOG,
 					af_alg_complete, &ctx->completion);

 	sk->sk_destruct = skcipher_sock_destruct;
--
2.7.0