nilfs2: fix NULL pointer dereference at nilfs_bmap_lookup_at_level()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.14.296 by commit 1ce68de30b663b79073251162123e57cbed2dc84. For more details please see the references link.