media: vivid: s_fbuf: add more sanity checks

media: vivid: s_fbuf: add more sanity checks

[ Upstream commit 4449856a56042d1e57977c3c8d205d2760796cc3 ]

VIDIOC_S_FBUF is by definition a scary ioctl, which is why only root
can use it. But at least check if the framebuffer parameters match that
of one of the framebuffer created by vivid, and reject anything else.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Fixes: aa12f8e066f1 ([media] vivid: add the video capture and output parts)
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>