linux-kernel - [PATCH v2] media: rc: ir-lirc-codec: fix integer overflow

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Message-ID: <20101204210522.GA5244@albatros>
Date:	Sun, 5 Dec 2010 00:05:22 +0300
From:	Vasiliy Kulikov <segoon@...nwall.com>
To:	Dan Carpenter <error27@...il.com>, kernel-janitors@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	David Härdeman <david@...deman.nu>,
	Jarod Wilson <jarod@...hat.com>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] media: rc: ir-lirc-codec: fix integer overflow

'n' may be bigger than MAX_INT*sizeof(int), if so checking of truncated
(int)(n/sizeof(int)) for LIRCBUF_SIZE overflows and then using nontruncated 'count'
doesn't make sense.  This is not a security issue as too big 'n' is catched in
kmalloc() in memdup_user() call.  However, it's better to prevent WARN() in kmalloc().

Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
---
 Compile tested only.

 drivers/media/rc/ir-lirc-codec.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/media/rc/ir-lirc-codec.c b/drivers/media/rc/ir-lirc-codec.c
index 1e87ee8..a7e91e6 100644
--- a/drivers/media/rc/ir-lirc-codec.c
+++ b/drivers/media/rc/ir-lirc-codec.c
@@ -100,7 +100,8 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf,
 	struct lirc_codec *lirc;
 	struct rc_dev *dev;
 	int *txbuf; /* buffer with values to transmit */
-	int ret = 0, count;
+	int ret = 0;
+	size_t count;
 
 	lirc = lirc_get_pdata(file);
 	if (!lirc)
-- 
1.7.0.4
--
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