linux-kernel - [PATCH AUTOSEL 5.19 047/105] media: mediatek: vcodec: return EINVAL if plane is too small

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Message-Id: <20220811152851.1520029-47-sashal@kernel.org>
Date:   Thu, 11 Aug 2022 11:27:31 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Justin Green <greenjustin@...omium.org>,
        Andres Calderon Jaramillo <andrescj@...omium.org>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sasha Levin <sashal@...nel.org>, tiffany.lin@...iatek.com,
        andrew-ct.chen@...iatek.com, matthias.bgg@...il.com,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.19 047/105] media: mediatek: vcodec: return EINVAL if plane is too small

From: Justin Green <greenjustin@...omium.org>

[ Upstream commit f5caaa47f55fa742f1a230e5b4258c139e223c74 ]

Modify vb2ops_vdec_buf_prepare to return EINVAL if the size of the plane
is less than the size of the image. Currently we just log an error and
return 0 anyway, which may cause a buffer overrun bug.

Signed-off-by: Justin Green <greenjustin@...omium.org>
Suggested-by: Andres Calderon Jaramillo <andrescj@...omium.org>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
index 52e5d36aa912..191e13344c53 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
@@ -735,6 +735,7 @@ int vb2ops_vdec_buf_prepare(struct vb2_buffer *vb)
 			mtk_v4l2_err("data will not fit into plane %d (%lu < %d)",
 				i, vb2_plane_size(vb, i),
 				q_data->sizeimage[i]);
+			return -EINVAL;
 		}
 		if (!V4L2_TYPE_IS_OUTPUT(vb->type))
 			vb2_set_plane_payload(vb, i, q_data->sizeimage[i]);
-- 
2.35.1