linux-kernel - [PATCH AUTOSEL 4.19 059/205] media: vicodec: fix out-of-range values when decoding

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Message-Id: <20191108113752.12502-59-sashal@kernel.org>
Date:   Fri,  8 Nov 2019 06:35:26 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 059/205] media: vicodec: fix out-of-range values when decoding

From: Hans Verkuil <hverkuil@...all.nl>

[ Upstream commit be5a1509af8dd8a78fea24a35fe4a82d4cd0ae70 ]

While decoding you need to make sure you do not get values < 0
or > 255. Note that since this code will also be used in userspace
utilities the clamp macro isn't used since that is kernel-only.

Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/vicodec/vicodec-codec.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/vicodec/vicodec-codec.c b/drivers/media/platform/vicodec/vicodec-codec.c
index 2d047646f6147..d854b2344f12b 100644
--- a/drivers/media/platform/vicodec/vicodec-codec.c
+++ b/drivers/media/platform/vicodec/vicodec-codec.c
@@ -588,8 +588,14 @@ static void fill_decoder_block(u8 *dst, const s16 *input, int stride)
 	int i, j;
 
 	for (i = 0; i < 8; i++) {
-		for (j = 0; j < 8; j++)
-			*dst++ = *input++;
+		for (j = 0; j < 8; j++, input++, dst++) {
+			if (*input < 0)
+				*dst = 0;
+			else if (*input > 255)
+				*dst = 255;
+			else
+				*dst = *input;
+		}
 		dst += stride - 8;
 	}
 }
-- 
2.20.1