| commit | bc811f05d77f47059c197a98b6ad242eb03999cb | [log] [tgz] |
|---|---|---|
| author | Jens Axboe <axboe@kernel.dk> | Tue Sep 04 11:52:34 2018 -0600 |
| committer | Jens Axboe <axboe@kernel.dk> | Tue Sep 04 11:54:58 2018 -0600 |
| tree | e96cabff009625665432d1b98fba898eabaa89ba | |
| parent | 3111885015b458c97b4cf272e2a87f1d6f0ed06a [diff] |
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>