linux-kernel - Re: [PATCH v3] media:exynos4-is: Fix a use after free in isp_video

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Message-ID: <ed80a3f0-048a-17df-4dff-e9d52b777699@samsung.com>
Date:   Tue, 27 Apr 2021 15:48:15 +0200
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     Lv Yunlong <lyl2019@...l.ustc.edu.cn>
Cc:     linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        mchehab@...nel.org, krzk@...nel.org
Subject: Re: [PATCH v3] media:exynos4-is: Fix a use after free in
 isp_video_release

On 27.04.2021 15:27, Lv Yunlong wrote:
> In isp_video_release, file->private_data is freed via
> _vb2_fop_release()->v4l2_fh_release(). But the freed
> file->private_data is still used in v4l2_fh_is_singular_file()
> ->v4l2_fh_is_singular(file->private_data), which is a use
> after free bug.
> 
> My patch sets file->private_data to NULL after _vb2_fop_release()
> to avoid the use after free, and uses a variable 'is_singular_file'
> to keep the original function unchanged.
> 
> Fixes: 34947b8aebe3f ("[media] exynos4-is: Add the FIMC-IS ISP capture DMA driver")
> Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>

Thanks,

Reviewed-by: Sylwester Nawrocki <s.nawrocki@...sung.com>