linux-kernel - Re: [PATCH] media: vidtv: Add the missing kfree to avoid the memory leak

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Message-ID: <dff360d3-ff6b-b90c-89aa-2e21120f9a3f@xs4all.nl>
Date:   Thu, 13 Jan 2022 11:09:14 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>, dwlsalmeida@...il.com,
        mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: vidtv: Add the missing kfree to avoid the memory
 leak

On 12/01/2022 03:05, Jiasheng Jiang wrote:
> Since kstrdup() allocate a space for e->name and will not automatically
> free.
> If kzalloc() fails, we just kfree e without e->name.
> Then we cannot get the pointer 'e->name' and cause the memory leak.
> 
> Fixes: 3d1387b3b8f6 ("media: vidtv: fix some warnings")
> Reported-by: Hans Verkuil <hverkuil@...all.nl>
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>  drivers/media/test-drivers/vidtv/vidtv_s302m.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/media/test-drivers/vidtv/vidtv_s302m.c b/drivers/media/test-drivers/vidtv/vidtv_s302m.c
> index ddaff46c440f..433fc0c7fdfa 100644
> --- a/drivers/media/test-drivers/vidtv/vidtv_s302m.c
> +++ b/drivers/media/test-drivers/vidtv/vidtv_s302m.c
> @@ -474,6 +474,7 @@ struct vidtv_encoder
>  
>  	ctx = kzalloc(priv_sz, GFP_KERNEL);
>  	if (!ctx) {
> +		kfree(e->name);

It should also free e->encoder_buf.

Regards,

	Hans

>  		kfree(e);
>  		return NULL;
>  	}