From: Peter Hutterer <peter.hutterer@who-t.net>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org,
Benjamin Tissoires <benjamin.tissoires@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Input: synaptics - avoid using uninitialized variable when probing
Date: Fri, 19 Oct 2018 15:46:24 +1000 [thread overview]
Message-ID: <20181019054624.GA2783@jelly> (raw)
In-Reply-To: <20181017001443.GA232819@dtor-ws>
On Tue, Oct 16, 2018 at 05:14:43PM -0700, Dmitry Torokhov wrote:
> 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 not use garbage on stack that just happen to be 0x47.
>
> Reported-by: syzbot+13cb3b01d0784e4ffc3f@syzkaller.appspotmail.com
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
doh, was just about to send out the same patch.
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Cheers,
Peter
> ---
> drivers/input/mouse/synaptics.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
> index 55d33500d55e..5e85f3cca867 100644
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -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);
> --
> 2.19.1.331.ge82ca0e54c-goog
>
>
> --
> Dmitry
prev parent reply other threads:[~2018-10-19 5:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-17 0:14 [PATCH] Input: synaptics - avoid using uninitialized variable when probing Dmitry Torokhov
2018-10-17 7:03 ` Benjamin Tissoires
2018-10-19 5:46 ` Peter Hutterer [this message]
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