linux-kernel - [PATCH 3.2 48/52] irda: precedence bug in irlmp_seq_hb

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Message-ID: <lsq.1448404439.187031289@decadent.org.uk>
Date:	Tue, 24 Nov 2015 22:33:59 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Berry Cheng 程君成淼)" 
	<chengmiao.cj@...baba-inc.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.2 48/52] irda: precedence bug in irlmp_seq_hb_idx()

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

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

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

[ Upstream commit 50010c20597d14667eff0fdb628309986f195230 ]

This is decrementing the pointer, instead of the value stored in the
pointer.  KASan detects it as an out of bounds reference.

Reported-by: "Berry Cheng 程君(成淼)" <chengmiao.cj@...baba-inc.com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/irda/irlmp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/irda/irlmp.c
+++ b/net/irda/irlmp.c
@@ -1868,7 +1868,7 @@ static void *irlmp_seq_hb_idx(struct irl
 	for (element = hashbin_get_first(iter->hashbin);
 	     element != NULL;
 	     element = hashbin_get_next(iter->hashbin)) {
-		if (!off || *off-- == 0) {
+		if (!off || (*off)-- == 0) {
 			/* NB: hashbin left locked */
 			return element;
 		}

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