From ba7ed691dcce1a4921ea92b8bf75af52f5e504f6 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Thu, 30 Mar 2017 09:05:25 -0300 Subject: [PATCH] [media] v4l2-compat-ioctl32: VIDIOC_S_EDID should return all fields on error Most ioctls do not have to write back the contents of the argument if an error is returned. But VIDIOC_S_EDID is an exception together with the EXT_CTRLS ioctls (already handled correctly). Add this exception to v4l2-compat-ioctl32. This fixes a compliance error when using compat32 and trying to set a new EDID with more blocks than the hardware supports. In that case the driver will return -E2BIG and set edid.blocks to the actual maximum number of blocks. This field was never copied back to userspace due to this bug. Signed-off-by: Hans Verkuil Acked-by: Sakari Ailus Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c index eac9565dc3d8..77b8a2dcfcdf 100644 --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -990,6 +990,10 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar if (put_v4l2_ext_controls32(&karg.v2ecs, up)) err = -EFAULT; break; + case VIDIOC_S_EDID: + if (put_v4l2_edid32(&karg.v2edid, up)) + err = -EFAULT; + break; } if (err) return err; @@ -1011,7 +1015,6 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar break; case VIDIOC_G_EDID: - case VIDIOC_S_EDID: err = put_v4l2_edid32(&karg.v2edid, up); break; -- 2.39.5