CVE-2024-39469 Information

Description

In the Linux kernel the following vulnerability has been resolved:

nilfs2: fix nilfs_empty_dir() misjudgment and long loop on I/O errors

The error handling in nilfs_empty_dir() when a directory folio/page read fails is incorrect as in the old ext2 implementation and if the folio/page cannot be read or nilfs_check_folio() fails it will falsely determine the directory as empty and corrupt the file system.

In addition since nilfs_empty_dir() does not immediately return on a failed folio/page read but continues to loop this can cause a long loop with I/O if i_size of the directory’s inode is also corrupted causing the log writer thread to wait and hang as reported by syzbot.

Fix these issues by making nilfs_empty_dir() immediately return a false value (0) if it fails to get a directory folio/page.

Reference

https://git.kernel.org/stable/c/129dcd3e7d036218db3f59c82d82004b9539ed82 https://git.kernel.org/stable/c/d18b05eda7fa77f02114f15b02c009f28ee42346 https://git.kernel.org/stable/c/59f14875a96ef93f05b82ad3c980605f2cb444b5 https://git.kernel.org/stable/c/7373a51e7998b508af7136530f3a997b286ce81c