linux-kernel - [PATCH AUTOSEL 6.12 18/23] media: s5p-mfc: Corrected NV12M/NV21M plane-sizes

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Message-Id: <20250331145510.1705478-18-sashal@kernel.org>
Date: Mon, 31 Mar 2025 10:55:04 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Aakarsh Jain <aakarsh.jain@...sung.com>,
	Hans Verkuil <hverkuil@...all.nl>,
	Nicolas Dufresne <nicolas.dufresne@...labora.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Sasha Levin <sashal@...nel.org>,
	andrzej.hajda@...el.com,
	mchehab@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 18/23] media: s5p-mfc: Corrected NV12M/NV21M plane-sizes

From: Aakarsh Jain <aakarsh.jain@...sung.com>

[ Upstream commit 7d0d0b2342bebc47a46499cdf21257ed1e58c4aa ]

There is a possibility of getting page fault if the overall
buffer size is not aligned to 256bytes. Since MFC does read
operation only and it won't corrupt the data values even if
it reads the extra bytes.
Corrected luma and chroma plane sizes for V4L2_PIX_FMT_NV12M
and V4L2_PIX_FMT_NV21M pixel format.

Suggested-by: Hans Verkuil <hverkuil@...all.nl>
Signed-off-by: Aakarsh Jain <aakarsh.jain@...sung.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
Acked-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Hans Verkuil <hverkuil@...all.nl>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/samsung/s5p-mfc/s5p_mfc_opr_v6.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_opr_v6.c b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_opr_v6.c
index 73f7af674c01b..0c636090d723d 100644
--- a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_opr_v6.c
+++ b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_opr_v6.c
@@ -549,8 +549,9 @@ static void s5p_mfc_enc_calc_src_size_v6(struct s5p_mfc_ctx *ctx)
 		case V4L2_PIX_FMT_NV21M:
 			ctx->stride[0] = ALIGN(ctx->img_width, S5P_FIMV_NV12M_HALIGN_V6);
 			ctx->stride[1] = ALIGN(ctx->img_width, S5P_FIMV_NV12M_HALIGN_V6);
-			ctx->luma_size = ctx->stride[0] * ALIGN(ctx->img_height, 16);
-			ctx->chroma_size =  ctx->stride[0] * ALIGN(ctx->img_height / 2, 16);
+			ctx->luma_size = ALIGN(ctx->stride[0] * ALIGN(ctx->img_height, 16), 256);
+			ctx->chroma_size = ALIGN(ctx->stride[0] * ALIGN(ctx->img_height / 2, 16),
+					256);
 			break;
 		case V4L2_PIX_FMT_YUV420M:
 		case V4L2_PIX_FMT_YVU420M:
-- 
2.39.5