linux-kernel - Re: [PATCH v2] media: rockchip/rga: fix potential use after free

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Date:   Mon, 11 Nov 2019 09:03:17 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Pan Bian <bianpan2016@....com>, Jacob Chen <jacob-chen@...wrt.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: rockchip/rga: fix potential use after free

Hi Pan Bian,

Thanks for the patch.

On Mon, 2019-11-11 at 16:28 +0800, Pan Bian wrote:
> The variable vga->vfd is an alias for vfd. Therefore, releasing vfd and
> then unregister vga->vfd will lead to a use after free bug. In fact, the
> free operation and the unregister operation are reversed.
> 

Out of curiosity, how did you find this potential bug?

Acked-by: Ezequiel Garcia <ezequiel@...labora.com>

Regards,
Ezequiel