patch "siox: fix possible buffer overflow in device_add_store" added to char-misc-testing

patch "siox: fix possible buffer overflow in device_add_store" added to char-misc-testing

[gregkh]

This is a note to let you know that I've just added the patch titled

    siox: fix possible buffer overflow in device_add_store

to my char-misc git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-testing branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will be merged to the char-misc-next branch sometime soon,
after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.


>From f87deada80fe483e2286e29cd866dc66ddc2b6bc Mon Sep 17 00:00:00 2001
From: Gavin Schenk <g.schenk@eckelmann.de>
Date: Wed, 14 Feb 2018 15:25:02 +0100
Subject: siox: fix possible buffer overflow in device_add_store
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Width 20 given in format string is larger than destination
buffer 'type[20]', use %19s to prevent overflowing it.

Fixes: bbecb07fa0af ("siox: new driver framework for eckelmann SIOX")
Cc: stable <stable@vger.kernel.org>
Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Gavin Schenk <g.schenk@eckelmann.de>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/siox/siox-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/siox/siox-core.c b/drivers/siox/siox-core.c
index fdfcdea25867..16590dfaafa4 100644
--- a/drivers/siox/siox-core.c
+++ b/drivers/siox/siox-core.c
@@ -594,7 +594,7 @@ static ssize_t device_add_store(struct device *dev,
 	size_t inbytes = 0, outbytes = 0;
 	u8 statustype = 0;
 
-	ret = sscanf(buf, "%20s %zu %zu %hhu", type, &inbytes,
+	ret = sscanf(buf, "%19s %zu %zu %hhu", type, &inbytes,
 		     &outbytes, &statustype);
 	if (ret != 3 && ret != 4)
 		return -EINVAL;
-- 
2.16.2