linux-kernel - Re: [PATCH] Input: synaptics - clear device info before filling in

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Message-ID: <20170530031654.GE32841@dtor-ws>
Date:   Mon, 29 May 2017 20:16:54 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Eric Biggers <ebiggers3@...il.com>
Cc:     linux-input@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-kernel@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH] Input: synaptics - clear device info before filling in

On Sun, May 28, 2017 at 10:27:07PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> synaptics_query_hardware() was being passed a
> 'struct synaptics_device_info' in uninitialized stack memory, then not
> always initializing all fields.  This caused garbage to show up in
> certain fields, making the touchpad unusable.
> 
> Fix by zeroing the device info, so all fields default to 0.
> 
> Fixes: 6c53694fb222 ("Input: synaptics - split device info into a separate structure")
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Applied, thank you.

> ---
>  drivers/input/mouse/synaptics.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
> index 131df9d3660f..4f97970abc94 100644
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -397,6 +397,8 @@ static int synaptics_query_hardware(struct psmouse *psmouse,
>  {
>  	int error;
>  
> +	memset(info, 0, sizeof(*info));
> +
>  	error = synaptics_identify(psmouse, info);
>  	if (error)
>  		return error;
> -- 
> 2.13.0
> 

-- 
Dmitry