From: Chen Cheng <chencheng@fnnas.com>

The previous patch rejects raid4/5 arrays with too few disks in
setup_conf(). During reshape assembly, raid5_run() still divides by the
data-disk count before that check, so a crafted superblock can hit
division by zero.

Extract min_raid_disks() and reject invalid reshape geometries in
raid5_run() first.

Chen Cheng (2):
  md/raid5: extract min_raid_disks()
  md/raid5: reject invalid reshape disks in raid5_run()

 drivers/md/raid5.c | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

-- 
2.55.0