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

[Vasiliy Kulikov <segoon@openwall.com>]

'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@openwall.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