linux-kernel - Re: [PATCH v2] drivers/media/v4l2-core/v4l2-h264 : add detection of null pointers

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Date:   Mon, 26 Dec 2022 18:22:05 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Dong Chuanjian <chuanjian@...china.com>
Cc:     mchehab@...nel.org, hverkuil-cisco@...all.nl,
        nicolas.dufresne@...labora.com, sebastian.fricke@...labora.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drivers/media/v4l2-core/v4l2-h264 : add detection of
 null pointers

Hi,

On Mon, Dec 26, 2022 at 03:02:36PM +0800, Dong Chuanjian wrote:
> When the pointer variable is judged to be null, null is returned
> directly.
> 
> Signed-off-by: Dong Chuanjian <chuanjian@...china.com>
> ---
>  v2: Directly return when pointer allocation fails.
> 
> diff --git a/drivers/media/v4l2-core/v4l2-h264.c b/drivers/media/v4l2-core/v4l2-h264.c
> index 72bd64f65198..0e7b35ae3e94 100644
> --- a/drivers/media/v4l2-core/v4l2-h264.c
> +++ b/drivers/media/v4l2-core/v4l2-h264.c
> @@ -343,6 +343,8 @@ static const char *format_ref_list_b(const struct v4l2_h264_reflist_builder *bui
>  	int n = 0, i;
>  
>  	*out_str = kmalloc(tmp_str_size, GFP_KERNEL);
> +	if (*out_str == NULL)
> +		return NULL;
>  

format_ref_list_p has the same issue.

>  	n += snprintf(*out_str + n, tmp_str_size - n, "|");
>  
> @@ -356,7 +358,6 @@ static const char *format_ref_list_b(const struct v4l2_h264_reflist_builder *bui
>  			       longterm ? 'l' : 's',
>  			       ref_type_to_char(reflist[i].fields));
>  	}
> -

Avoid spurious changes.

>  	return *out_str;
>  }
>  
> -- 
> 2.18.2
>