tree ffa8ce23a4fd2f4122bcf1cbb9ec38241f4743fe
parent f7c7d6ccc503c0a5f4e5debb570b55bf2eb24c73
author Sakari Ailus <sakari.ailus@linux.intel.com> 1608416998 +0100
committer Mauro Carvalho Chehab <mchehab+huawei@kernel.org> 1610467576 +0100

media: v4l: ioctl: Fix memory leak in video_usercopy

When an IOCTL with argument size larger than 128 that also used array
arguments were handled, two memory allocations were made but alas, only
the latter one of them was released. This happened because there was only
a single local variable to hold such a temporary allocation.

Fix this by adding separate variables to hold the pointers to the
temporary allocations.

Reported-by: Arnd Bergmann <arnd@kernel.org>
Reported-by: syzbot+1115e79c8df6472c612b@syzkaller.appspotmail.com
Fixes: d14e6d76ebf7 ("[media] v4l: Add multi-planar ioctl handling code")
Cc: stable@vger.kernel.org
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>