linux-kernel - [022/121] NFSv4.1: integer overflow in decode_cb_sequence

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Message-ID: <lsq.1378608721.448145107@decadent.org.uk>
Date:	Sun, 08 Sep 2013 03:52:01 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Dan Carpenter" <dan.carpenter@...cle.com>,
	"Trond Myklebust" <Trond.Myklebust@...app.com>
Subject: [022/121] NFSv4.1: integer overflow in decode_cb_sequence_args()

3.2.51-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 0439f31c35d1da0b28988b308ea455e38e6a350d upstream.

This seems like it could overflow on 32 bits.  Use kmalloc_array() which
has overflow protection built in.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/nfs/callback_xdr.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -451,9 +451,9 @@ static __be32 decode_cb_sequence_args(st
 	args->csa_nrclists = ntohl(*p++);
 	args->csa_rclists = NULL;
 	if (args->csa_nrclists) {
-		args->csa_rclists = kmalloc(args->csa_nrclists *
-					    sizeof(*args->csa_rclists),
-					    GFP_KERNEL);
+		args->csa_rclists = kmalloc_array(args->csa_nrclists,
+						  sizeof(*args->csa_rclists),
+						  GFP_KERNEL);
 		if (unlikely(args->csa_rclists == NULL))
 			goto out;
 

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