linux-kernel - [patch 1/2] NFSv4.1: integer overflow in decode_cb_sequence

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Message-ID: <20120612073707.GA15060@elgon.mountain>
Date:	Tue, 12 Jun 2012 10:37:08 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Benny Halevy <bhalevy@...asas.com>,
	kernel-janitors@...r.kernel.org
Subject: [patch 1/2] NFSv4.1: integer overflow in decode_cb_sequence_args()

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>

diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index 95bfc24..27c2969 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -455,9 +455,9 @@ static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
 	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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