linux-kernel - Re: [PATCH] media: atomisp-mt9m114: Fix pointer dereferenced before checking

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Date:   Tue, 31 May 2022 09:41:41 +0800
From:   baihaowen <baihaowen@...zu.com>
To:     Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-media@...r.kernel.org>, <linux-staging@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: atomisp-mt9m114: Fix pointer dereferenced before
 checking

在 2022/5/30 下午7:37, Tommaso Merciai 写道:
> On Mon, May 30, 2022 at 01:22:32PM +0200, Tommaso Merciai wrote:
>> On Mon, May 30, 2022 at 03:58:01PM +0800, Haowen Bai wrote:
>>> The info->data is dereferencing before null checking, so move
>>> it after checking.
>>>
>>> Signed-off-by: Haowen Bai <baihaowen@...zu.com>
>>> ---
>>>  drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c | 4 +++-
>>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
>>> index 00d6842c07d6..3c81ab73cdae 100644
>>> --- a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
>>> +++ b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
>>> @@ -616,13 +616,15 @@ static int mt9m114_get_intg_factor(struct i2c_client *client,
>>>  				   struct camera_mipi_info *info,
>>>  				   const struct mt9m114_res_struct *res)
>>>  {
>>> -	struct atomisp_sensor_mode_data *buf = &info->data;
>>> +	struct atomisp_sensor_mode_data *buf;
>>>  	u32 reg_val;
>>>  	int ret;
>>>  
>>>  	if (!info)
>>>  		return -EINVAL;
>>>  
>>> +	buf = &info->data;
>>> +
>>>  	ret =  mt9m114_read_reg(client, MISENSOR_32BIT,
>>>  				REG_PIXEL_CLK, &reg_val);
>>>  	if (ret)
>>> -- 
>>> 2.7.4
>>>
>> Hi Haowen,
>> Looks good to me, thanks.
>>
>> Reviewed-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
> Hi,
> My bad, Dan is right. Nothing to fix here.
> Sorry for previous review.
>
> Regards,
> Tommaso
>> -- 
>> Tommaso Merciai
>> Embedded Linux Engineer
>> tommaso.merciai@...rulasolutions.com
>> __________________________________
>>
>> Amarula Solutions SRL
>> Via Le Canevare 30, 31100 Treviso, Veneto, IT
>> T. +39 042 243 5310
>> info@...rulasolutions.com
>> www.amarulasolutions.com
hi, Dan
Thank you for pointing out. I'm clear now.

-- 
Haowen Bai