CVE-2026-97551xfs: initialise args->total for parent pointer updates

Official description

In the Linux kernel, the following vulnerability has been resolved: xfs: initialise args->total for parent pointer updates xfs_parent_da_args_init() builds an xfs_da_args from a zeroed xfs_parent_args (kmem_cache_zalloc), leaving args->total == 0. xfs_da_grow_inode_int() treats that field as a running block reservation and subtracts from it; because it is an xfs_extlen_t (uint32_t), the first attr-fork growth wraps it to ~0U. That defeats the free-space check in xfs_alloc_space_available(), and when it coincides with an AG that has exactly zero available blocks the allocation is clamped to maxlen 0 and returns -ENOSPC, which xfs_defer_finish_noroll() escalates to a filesystem shutdown. Set args->total the way the log recovery path does (xfs_attri_recover_work(), xfs_attr_item.c:706), in the add and replace paths that can grow the fork. Removals and lookups never grow it, so they leave the field alone, matching that switch.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/9ad85bce62cadfdf4242f6e6bbff2a52e51d30f1
• https://git.kernel.org/stable/c/c66e138af626cad4210da449996ae9e07ee63add
• https://git.kernel.org/stable/c/ac9032882d673dd6679e1d873a2dc0131a1aeb43
• https://git.kernel.org/stable/c/8e4ebb6afaa34bd2e8ce52da231003d24111c2d6