- Fix DM verity target's optional argument processing.

- Fix DM core's zoned model and zone sectors checks.

- Fix spurious "detected capacity change" pr_info() when creating new
  DM device.

- Fix DM ioctl out of bounds array access in handling of
  DM_LIST_DEVICES_CMD when no devices exist.
dm ioctl: fix out of bounds array access when no devices

If there are not any dm devices, we need to zero the "dev" argument in
the first structure dm_name_list. However, this can cause out of
bounds write, because the "needed" variable is zero and len may be
less than eight.

Fix this bug by reporting DM_BUFFER_FULL_FLAG if the result buffer is
too small to hold the "nl->dev" value.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
1 file changed