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From:   Jammy Huang <jammy_huang@aspeedtech.com>
To:     <eajames@linux.ibm.com>, <mchehab@kernel.org>, <joel@jms.id.au>,
        <andrew@aj.id.au>, <linux-media@vger.kernel.org>,
        <openbmc@lists.ozlabs.org>, <linux-arm-kernel@lists.infradead.org>,
        <linux-aspeed@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH] media: aspeed: Fix memory overwrite if timing is 1600x900
Date:   Wed, 12 Jul 2023 17:26:06 +0800
Message-ID: <20230712092606.2508-1-jammy_huang@aspeedtech.com>
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When capturing 1600x900, system could crash when system memory usage is
tight.

The size of macro block captured is 8x8. Therefore, we should make sure
the height of src-buf is 8 aligned to fix this issue.

Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
---
 drivers/media/platform/aspeed/aspeed-video.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/aspeed/aspeed-video.c b/drivers/media/platform/aspeed/aspeed-video.c
index 374eb7781936..14594f55a77f 100644
--- a/drivers/media/platform/aspeed/aspeed-video.c
+++ b/drivers/media/platform/aspeed/aspeed-video.c
@@ -1130,7 +1130,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
 static void aspeed_video_set_resolution(struct aspeed_video *video)
 {
 	struct v4l2_bt_timings *act = &video->active_timings;
-	unsigned int size = act->width * act->height;
+	unsigned int size = act->width * ALIGN(act->height, 8);
 
 	/* Set capture/compression frame sizes */
 	aspeed_video_calc_compressed_size(video, size);
@@ -1147,7 +1147,7 @@ static void aspeed_video_set_resolution(struct aspeed_video *video)
 		u32 width = ALIGN(act->width, 64);
 
 		aspeed_video_write(video, VE_CAP_WINDOW, width << 16 | act->height);
-		size = width * act->height;
+		size = width * ALIGN(act->height, 8);
 	} else {
 		aspeed_video_write(video, VE_CAP_WINDOW,
 				   act->width << 16 | act->height);

base-commit: 2605e80d3438c77190f55b821c6575048c68268e
-- 
2.25.1