This is a note to let you know that I've just added the patch titled
Input: synaptics - avoid using uninitialized variable when probing
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
input-synaptics-avoid-using-uninitialized-variable-when-probing.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f39f8688888ae74fa8deae2d01289b69b4727394 Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Date: Tue, 16 Oct 2018 17:07:35 -0700
Subject: Input: synaptics - avoid using uninitialized variable when probing
From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
commit f39f8688888ae74fa8deae2d01289b69b4727394 upstream.
synaptics_detect() does not check whether sending commands to the
device succeeds and instead relies on getting unique data from the
device. Let's make sure we seed entire buffer with zeroes to make sure
we will not use garbage on stack that just happen to be 0x47.
Reported-by: syzbot+13cb3b01d0784e4ffc3f@xxxxxxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Reviewed-by: Peter Hutterer <peter.hutterer@xxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/input/mouse/synaptics.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -99,9 +99,7 @@ static int synaptics_mode_cmd(struct psm
int synaptics_detect(struct psmouse *psmouse, bool set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
- u8 param[4];
-
- param[0] = 0;
+ u8 param[4] = { 0 };
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
Patches currently in stable-queue which might be from dmitry.torokhov@xxxxxxxxx are
queue-4.14/input-synaptics-avoid-using-uninitialized-variable-when-probing.patch
