tree e96cabff009625665432d1b98fba898eabaa89ba
parent 3111885015b458c97b4cf272e2a87f1d6f0ed06a
author Jens Axboe <axboe@kernel.dk> 1536083554 -0600
committer Jens Axboe <axboe@kernel.dk> 1536083698 -0600

nbd: don't allow invalid blocksize settings

syzbot reports a divide-by-zero off the NBD_SET_BLKSIZE ioctl.
We need proper validation of the input here. Not just if it's
zero, but also if the value is a power-of-2 and in a valid
range. Add that.

Cc: stable@vger.kernel.org
Reported-by: syzbot <syzbot+25dbecbec1e62c6b0dd4@syzkaller.appspotmail.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>