Linux Kernel Btrfs Zoned Filesystem NULL Pointer Dereference Vulnerability

A vulnerability in the Linux kernel's Btrfs file system handling of zoned devices can lead to a NULL pointer dereference. This issue arises during the seeding process on a zoned filesystem, where the Btrfs zoned device information structure for each zoned device must be properly initialized. Failure to do so results in a NULL pointer dereference when the filesystem is mounted. This vulnerability was identified through the fstests Btrfs test case 163.

Impact

Exploitation of this vulnerability causes a NULL pointer dereference, leading to a kernel crash.