linux-kernel - Re: [PATCH] drivers: staging: greybus: fix GPF issue in gb_camera

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Message-ID: <6b0523d1-c8ff-d746-bf50-ddabadd07bcf@hust.edu.cn>
Date:   Thu, 4 May 2023 23:08:24 +0800
From:   Dongliang Mu <dzm91@...t.edu.cn>
To:     Dan Carpenter <dan.carpenter@...aro.org>
Cc:     Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jacopo Mondi <jacopo.mondi@...aro.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        greybus-dev@...ts.linaro.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: staging: greybus: fix GPF issue in
 gb_camera_capture


On 5/4/23 PM10:53, Dan Carpenter wrote:
> On Thu, May 04, 2023 at 09:58:41PM +0800, Dongliang Mu wrote:
>> In gb_camera_capture(), it does not check the value of settings
>> before dereferencing it. And gb_camera_debugfs_capture calls
>> gb_camera_capture with the 6th parameter settings as NULL.
>>
>> Fix this by checking the value of setting at the starting of
>> gb_camera_capture.
>>
>> Fixes: 3265edaf0d70 ("greybus: Add driver for the camera class protocol")
>> Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>
>> ---
> No.  The original code is correct.  memcpy(p, NULL, 0); is allowed.

Oh, I see. This memcpy with src as NULL and len as zero is intended.

Thanks, Dan.

Sorry for the false alarm, guys.

> I don't see a bug.
>
> regards,
> dan carpenter