CVE-2025-71267

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

fs: ntfs3: fix infinite loop triggered by zero-sized ATTR_LIST

We found an infinite loop bug in the ntfs3 file system that can lead to a

Denial-of-Service (DoS) condition.

A malformed NTFS image can cause an infinite loop when an ATTR_LIST attribute

indicates a zero data size while the driver allocates memory for it.

When ntfs_load_attr_list() processes a resident ATTR_LIST with data_size set

to zero, it still allocates memory because of al_aligned(0). This creates an

inconsistent state where ni->attr_list.size is zero, but ni->attr_list.le is

non-null. This causes ni_enum_attr_ex to incorrectly assume that no attribute

list exists and enumerates only the primary MFT record. When it finds

ATTR_LIST, the code reloads it and restarts the enumeration, repeating

indefinitely. The mount operation never completes, hanging the kernel thread.

This patch adds validation to ensure that data_size is non-zero before memory

allocation. When a zero-sized ATTR_LIST is detected, the function returns

-EINVAL, preventing a DoS vulnerability.