linux-kernel - [PATCH RESEND v2] media: aspeed: Fix memory overwrite if timing is 1600x900

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Message-ID: <TYZPR06MB6568A36C5201185B4D3F80C0F139A@TYZPR06MB6568.apcprd06.prod.outlook.com>
Date:   Wed, 19 Jul 2023 06:33:18 +0000
From:   Jammy Huang <jammy_huang@...eedtech.com>
To:     Hans Verkuil <hverkuil@...all.nl>,
        "eajames@...ux.ibm.com" <eajames@...ux.ibm.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "joel@....id.au" <joel@....id.au>,
        "andrew@...id.au" <andrew@...id.au>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH RESEND v2] media: aspeed: Fix memory overwrite if timing is
 1600x900

When capturing 1600x900, system could crash when system memory usage is
tight.

The way to reproduce this issue:
1. Use 1600x900 to display on host
2. Mount ISO through 'Virtual media' on OpenBMC's web
3. Run script as below on host to do sha continuously
  #!/bin/bash
  while [ [1] ];
  do
	find /media -type f -printf '"%h/%f"\n' | xargs sha256sum
  done
4. Open KVM on OpenBMC's web

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@...eedtech.com>
---
 v2 changes
  - Add how to reproduce this issue.
---
 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