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Subject[PATCH 2.6.32 38/62] s5h1420: fix a buffer overflow when checking userspace params
2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

commit 12f4543f5d6811f864e6c4952eb27253c7466c02 upstream.

The maximum size for a DiSEqC command is 6, according to the
userspace API. However, the code allows to write up to 7 values:
drivers/media/dvb-frontends/s5h1420.c:193 s5h1420_send_master_cmd() error: buffer overflow 'cmd->msg' 6 <= 7

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from commit 4bf124b5f179a9c169c57ef7cd3a74f239063ed1)

Signed-off-by: Willy Tarreau <w@1wt.eu>
---
drivers/media/dvb/frontends/s5h1420.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/dvb/frontends/s5h1420.c b/drivers/media/dvb/frontends/s5h1420.c
index 2e9fd28..6134578 100644
--- a/drivers/media/dvb/frontends/s5h1420.c
+++ b/drivers/media/dvb/frontends/s5h1420.c
@@ -180,7 +180,7 @@ static int s5h1420_send_master_cmd (struct dvb_frontend* fe,
int result = 0;

dprintk("enter %s\n", __func__);
- if (cmd->msg_len > 8)
+ if (cmd->msg_len > sizeof(cmd->msg))
return -EINVAL;

/* setup for DISEQC */
--
1.7.12.2.21.g234cd45.dirty




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