linux-kernel - Re: [PATCH] drm/atmel_hlcdc: Fix uninitialized variable

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Message-ID: <0c7d1063-963a-418e-a6e9-8482f0f7cfd0@microchip.com>
Date: Mon, 7 Oct 2024 03:13:50 +0000
From: <Manikandan.M@...rochip.com>
To: <skhan@...uxfoundation.org>, <advaitdhamorikar@...il.com>,
	<sam@...nborg.org>, <bbrezillon@...nel.org>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <simona@...ll.ch>,
	<Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<claudiu.beznea@...on.dev>
CC: <dri-devel@...ts.freedesktop.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <anupnewsmail@...il.com>
Subject: Re: [PATCH] drm/atmel_hlcdc: Fix uninitialized variable

Hi Shuah and Advait,

On 05/10/24 12:41 am, Shuah Khan wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know 
> the content is safe
> 
> On 10/4/24 09:08, Advait Dhamorikar wrote:
>> atmel_hlcdc_plane_update_buffers: may use an uninitialized
>> sr variable when the if condition remains unsatisfied
>>
> 
> As mentioned in my response to another one of your patches,
> include how you found the problem in the change log.
> 
This is smatch warning reported by Dan and Kernel Test Robot.
Kindly add the tags mentioned in the below link in the next version.

https://lore.kernel.org/oe-kbuild/202409240320.MZPgi3Up-lkp@intel.com/
>> Signed-off-by: Advait Dhamorikar <advaitdhamorikar@...il.com>
>> ---
>>   drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c 
>> b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
>> index 4a7ba0918eca..4150c4d0b4f2 100644
>> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
>> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
>> @@ -559,7 +559,7 @@ static void 
>> atmel_hlcdc_plane_update_buffers(struct atmel_hlcdc_plane *plane,
>>       const struct atmel_hlcdc_layer_desc *desc = plane->layer.desc;
>>       struct atmel_hlcdc_dc *dc = plane->base.dev->dev_private;
>>       struct drm_framebuffer *fb = state->base.fb;
>> -     u32 sr;
>> +     u32 sr = 0;
> 
>>       int i;
>>
>>       if (!dc->desc->is_xlcdc)
> 
> sr could be used uninitialized in the for loop, !dc->desc->is_xlcdc
> case. However, is 0 the right initialization for this value?
> 
initializing sr to 0 is the right way

Thank you for taking care of the same
> thanks,
> -- Shuah

-- 
Thanks and Regards,
Manikandan M.