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media: v4l2-compat-ioctl32.c: zero buffer passed to v4l2_compat_get_array_args()

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commit 4e768c8e34 upstream.

The v4l2_compat_get_array_args() function can leave uninitialized memory in the
buffer it is passed. So zero it before copying array elements from userspace
into the buffer.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: syzbot+ff18193ff05f3f87f226@syzkaller.appspotmail.com
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans Verkuil 2022-03-21 08:33:56 +00:00 committed by Greg Kroah-Hartman
parent ab9d328447
commit a6a3b6b11a
1 changed files with 2 additions and 0 deletions
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2
drivers/media/v4l2-core/v4l2-compat-ioctl32.c
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@ -1033,6 +1033,8 @@ int v4l2_compat_get_array_args(struct file *file, void *mbuf,
{
int err = 0;
memset(mbuf, 0, array_size);
switch (cmd) {
case VIDIOC_G_FMT32:
case VIDIOC_S_FMT32: