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Message-Id: <1440713521-5906-17-git-send-email-kamal@canonical.com>
Date: Thu, 27 Aug 2015 15:10:07 -0700
From: Kamal Mostafa <kamal@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Oleksij Rempel <external.Oleksij.Rempel@...bosch.com>,
Dirk Behme <dirk.behme@...bosch.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 016/130] Input: zforce - don't overwrite the stack
3.19.8-ckt6 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Oleksij Rempel <external.Oleksij.Rempel@...bosch.com>
commit 7d01cd261c76f95913c81554a751968a1d282d3a upstream.
If we get a corrupted packet with PAYLOAD_LENGTH > FRAME_MAXSIZE, we
will silently overwrite the stack.
Signed-off-by: Oleksij Rempel <external.Oleksij.Rempel@...bosch.com>
Signed-off-by: Dirk Behme <dirk.behme@...bosch.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
drivers/input/touchscreen/zforce_ts.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/input/touchscreen/zforce_ts.c b/drivers/input/touchscreen/zforce_ts.c
index 19880c7..a9e1ee3 100644
--- a/drivers/input/touchscreen/zforce_ts.c
+++ b/drivers/input/touchscreen/zforce_ts.c
@@ -430,7 +430,7 @@ static int zforce_read_packet(struct zforce_ts *ts, u8 *buf)
goto unlock;
}
- if (buf[PAYLOAD_LENGTH] == 0) {
+ if (buf[PAYLOAD_LENGTH] == 0 || buf[PAYLOAD_LENGTH] > FRAME_MAXSIZE) {
dev_err(&client->dev, "invalid payload length: %d\n",
buf[PAYLOAD_LENGTH]);
ret = -EIO;
--
1.9.1
--
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