[PATCH 3.4 089/214] NFSv4.1: integer overflow in decode_cb_sequence_args()

From: Greg Kroah-Hartman
Date: Thu Jun 05 2014 - 00:56:32 EST


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

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

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Rui Xiang <rui.xiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
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
@@ -455,9 +455,9 @@ 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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