CVE-2024-50202

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

nilfs2: propagate directory read errors from nilfs_find_entry()

Syzbot reported that a task hang occurs in vcs_open() during a fuzzing

test for nilfs2.

The root cause of this problem is that in nilfs_find_entry(), which

searches for directory entries, ignores errors when loading a directory

page/folio via nilfs_get_folio() fails.

If the filesystem images is corrupted, and the i_size of the directory

inode is large, and the directory page/folio is successfully read but

fails the sanity check, for example when it is zero-filled,

nilfs_check_folio() may continue to spit out error messages in bursts.

Fix this issue by propagating the error to the callers when loading a

page/folio fails in nilfs_find_entry().

The current interface of nilfs_find_entry() and its callers is outdated

and cannot propagate error codes such as -EIO and -ENOMEM returned via

nilfs_find_entry(), so fix it together.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References