[PATCH] media: cedrus: Fix SUNXI tile size calculation

Tiled formats requires full rows being allocated (even for Chroma
planes). When the number of Luma tiles is odd, we need to round up
to twice the tile width in order to roundup the number of Chroma
tiles.

This was notice with a crash running BA1_FT_C compliance test using
sunxi tiles using GStreamer. Cedrus driver would allocate 9 rows for
Luma, but only 4.5 rows for Chroma, causing userspace to crash.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
---
 drivers/staging/media/sunxi/cedrus/cedrus_video.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.c b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
index 32c13ecb22d8..a8168ac2fbd0 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.c

@@ -135,7 +135,7 @@ void cedrus_prepare_format(struct v4l2_pix_format *pix_fmt)
 		sizeimage = bytesperline * height;
 
 		/* Chroma plane size. */
-		sizeimage += bytesperline * height / 2;
+		sizeimage += bytesperline * ALIGN(height, 64) / 2;
 
 		break;
 

-- 
2.31.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Hi Nicolas!

Dne četrtek, 19. avgust 2021 ob 16:00:09 CEST je Nicolas Dufresne napisal(a):

Tiled formats requires full rows being allocated (even for Chroma
planes). When the number of Luma tiles is odd, we need to round up
to twice the tile width in order to roundup the number of Chroma
tiles.

This was notice with a crash running BA1_FT_C compliance test using
sunxi tiles using GStreamer. Cedrus driver would allocate 9 rows for
Luma, but only 4.5 rows for Chroma, causing userspace to crash.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>

Fixes tag would be nice so it would be picked up for stable branches. 
Otherwise it looks good. It also aligns logic with libvdpau-sunxi.

Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej



_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Le jeudi 19 août 2021 à 18:30 +0200, Jernej Škrabec a écrit :

Hi Nicolas!

Dne četrtek, 19. avgust 2021 ob 16:00:09 CEST je Nicolas Dufresne napisal(a):

quoted

Tiled formats requires full rows being allocated (even for Chroma
planes). When the number of Luma tiles is odd, we need to round up
to twice the tile width in order to roundup the number of Chroma
tiles.

This was notice with a crash running BA1_FT_C compliance test using
sunxi tiles using GStreamer. Cedrus driver would allocate 9 rows for
Luma, but only 4.5 rows for Chroma, causing userspace to crash.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>

Fixes tag would be nice so it would be picked up for stable branches. 
Otherwise it looks good. It also aligns logic with libvdpau-sunxi.

Sure, I'd say can be merged adding (it was broken since when cedrus was added):

Fixes: 50e761516f2b8 ("media: platform: Add Cedrus VPU decoder driver")

Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel