CVE-2023-54272

/// Technical description

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

fs/ntfs3: Fix a possible null-pointer dereference in ni_clear()

In a previous commit c1006bd13146, ni->mi.mrec in ni_write_inode()

could be NULL, and thus a NULL check is added for this variable.

However, in the same call stack, ni->mi.mrec can be also dereferenced

in ni_clear():

ntfs_evict_inode(inode)

ni_write_inode(inode, ...)

ni = ntfs_i(inode);

is_rec_inuse(ni->mi.mrec) -> Add a NULL check by previous commit

ni_clear(ntfs_i(inode))

is_rec_inuse(ni->mi.mrec) -> No check

Thus, a possible null-pointer dereference may exist in ni_clear().

To fix it, a NULL check is added in this function.

/// 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