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commitb3a0066005upstream. fsnotify_add_mark_locked() can fail but we do not check its return value. This didn't matter before commit9dd813c15b"fsnotify: Move mark list head from object into dedicated structure" as none of possible failures could happen for dnotify but after that commit -ENOMEM can be returned. Handle this error properly in fcntl_dirnotify() as otherwise we just hit BUG_ON(dn_mark->dn) in dnotify_free_mark(). Reviewed-by: Amir Goldstein <amir73il@gmail.com> Reported-by: syzkaller Fixes:9dd813c15bSigned-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>