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Input: synaptics - avoid using uninitialized variable when probing 

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@syzkaller.appspotmail.com
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
hifive-unleashed-5.1
Dmitry Torokhov 2018-10-16 17:07:35 -07:00
parent 9023705192
commit f39f868888
1 changed files with 1 additions and 3 deletions
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4
drivers/input/mouse/synaptics.c
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@ -99,9 +99,7 @@ static int synaptics_mode_cmd(struct psmouse *psmouse, u8 mode)
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);