nilfs2: handle corrupted checkpoint count gracefully during deletion

Syzkaller reported a kernel warning in nilfs_cpfile_delete_checkpoints()
due to a corrupted checkpoint count on the storage medium where
le32_to_cpu(cp->cp_checkpoints_count) is less than the number of
checkpoints being deleted.
Triggering a WARN_ON() for disk image corruption is suboptimal. Fix
this by returning -EIO and reporting a filesystem error via
nilfs_error() instead of interrupting execution with a kernel warning.

Reported-by: syzbot+79b815da3aec0a6a4d02@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=79b815da3aec0a6a4d02
Signed-off-by: Igor Putko <igorpetindev@gmail.com>
Fixes: 1f5abe7e7dbc ("nilfs2: replace BUG_ON and BUG calls triggerable from ioctl")
Cc: stable+noautosel@kernel.org # Warning suppression primarily; will request backport individually if needed
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Viacheslav Dubeyko <slava@dubeyko.com>

0 files changed, 0 insertions, 0 deletions