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

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Date:   Thu, 4 May 2023 23:09:53 +0800
From:   Dongliang Mu <dzm91@...t.edu.cn>
To:     Johan Hovold <johan@...nel.org>
Cc:     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 PM10:54, Johan Hovold 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.
> Looks like you just broke gb_camera_debugfs_capture() which relies on
> passing NULL as settings.

Yes, just mentioned by Dan, this memcpy is intended with zero length and 
NULL src.

Please ignore this patch.

>> 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>
>> ---
>>   drivers/staging/greybus/camera.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/greybus/camera.c b/drivers/staging/greybus/camera.c
>> index cdbb42cd413b..5a4b26e7f645 100644
>> --- a/drivers/staging/greybus/camera.c
>> +++ b/drivers/staging/greybus/camera.c
>> @@ -659,7 +659,7 @@ static int gb_camera_capture(struct gb_camera *gcam, u32 request_id,
>>   	size_t req_size;
>>   	int ret;
>>   
>> -	if (settings_size > GB_CAMERA_MAX_SETTINGS_SIZE)
>> +	if (settings_size > GB_CAMERA_MAX_SETTINGS_SIZE || !settings)
>>   		return -EINVAL;
>>   
>>   	req_size = sizeof(*req) + settings_size;
> Johan