linux-kernel - Re: [PATCH v2] media: mediatek: vcodec: fix h264 cavlc bitstream fail

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Message-ID: <CAGXv+5GsE1s3gYSt7u=sMZR=FhnpDfxq_XhxUTUrKw+EM423PA@mail.gmail.com>
Date:   Mon, 14 Nov 2022 14:12:45 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Yunfei Dong <yunfei.dong@...iatek.com>
Cc:     Nicolas Dufresne <nicolas@...fresne.ca>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        George Sun <george.sun@...iatek.com>,
        Xiaoyong Lu <xiaoyong.lu@...iatek.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Steve Cho <stevecho@...omium.org>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2] media: mediatek: vcodec: fix h264 cavlc bitstream fail

On Tue, Oct 18, 2022 at 7:41 PM Yunfei Dong <yunfei.dong@...iatek.com> wrote:
>
> Some cavlc bistream will decode fail when the frame size is small than
> 20 bytes. Need to add pending data at the end of the bitstream.
>
> For the minimum size of mapped memory is 256 bytes(16x16), adding four bytes data
> won't lead to access unknown virtual memory.
>
> Fixes: 59fba9eed5a7 ("media: mediatek: vcodec: support stateless H.264 decoding for mt8192")
> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>

Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>