linux-kernel - [PATCH 4.1 076/123] Input: zforce

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Date:	Sat,  8 Aug 2015 15:09:14 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Oleksij Rempel <external.Oleksij.Rempel@...bosch.com>,
	Dirk Behme <dirk.behme@...bosch.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 4.1 076/123] Input: zforce - dont overwrite the stack

4.1-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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/input/touchscreen/zforce_ts.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/input/touchscreen/zforce_ts.c
+++ b/drivers/input/touchscreen/zforce_ts.c
@@ -430,7 +430,7 @@ static int zforce_read_packet(struct zfo
 		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;


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