CVE-2023-53804

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nilfs2: fix use-after-free bug of nilfs_root in nilfs_evict_inode()<br /> <br /> During unmount process of nilfs2, nothing holds nilfs_root structure after<br /> nilfs2 detaches its writer in nilfs_detach_log_writer(). However, since<br /> nilfs_evict_inode() uses nilfs_root for some cleanup operations, it may<br /> cause use-after-free read if inodes are left in "garbage_list" and<br /> released by nilfs_dispose_list() at the end of nilfs_detach_log_writer().<br /> <br /> Fix this issue by modifying nilfs_evict_inode() to only clear inode<br /> without additional metadata changes that use nilfs_root if the file system<br /> is degraded to read-only or the writer is detached.