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

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Date:   Thu, 4 May 2023 17:53:02 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     Dongliang Mu <dzm91@...t.edu.cn>
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 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.

I don't see a bug.

regards,
dan carpenter