linux-kernel - [PATCH] mwifiex: avoid out of bounds access in mwifiex_get_common

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Message-Id: <1359326568-17022-1-git-send-email-tipecaml@gmail.com>
Date:	Sun, 27 Jan 2013 23:42:48 +0100
From:	Cyril Roelandt <tipecaml@...il.com>
To:	bzhao@...vell.com, linville@...driver.com
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Cyril Roelandt <tipecaml@...il.com>
Subject: [PATCH] mwifiex: avoid out of bounds access in mwifiex_get_common_rates.

Check that the array indexes are in-bounds before accessing the rate2 and tmp
arrays.

Found with the following semantic patch:

<smpl>
@@
identifier t;
identifier idx;
expression E;
statement S;
@@
* for (... ; <+... t[idx] ...+> && idx < E ; ...)
S
</smpl>

Signed-off-by: Cyril Roelandt <tipecaml@...il.com>
---
 drivers/net/wireless/mwifiex/join.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mwifiex/join.c b/drivers/net/wireless/mwifiex/join.c
index 893d809..f0a634d 100644
--- a/drivers/net/wireless/mwifiex/join.c
+++ b/drivers/net/wireless/mwifiex/join.c
@@ -157,8 +157,8 @@ static int mwifiex_get_common_rates(struct mwifiex_private *priv, u8 *rate1,
 
 	memset(rate1, 0, rate1_size);
 
-	for (i = 0; rate2[i] && i < rate2_size; i++) {
-		for (j = 0; tmp[j] && j < rate1_size; j++) {
+	for (i = 0; i < rate2_size && rate2[i]; i++) {
+		for (j = 0; j < rate1_size && tmp[j]; j++) {
 			/* Check common rate, excluding the bit for
 			   basic rate */
 			if ((rate2[i] & 0x7F) == (tmp[j] & 0x7F)) {
-- 
1.7.10.4

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