xfs: initialise args->total for parent pointer updates

Summary

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.

Timeline

1. Sep 25, 2026, 10:21 AM UTCCVE published
2. Oct 19, 2026, 9:09 AM UTCRecord last updated

Affected versions

• Linux Linux

  From b7c62d90c12c6cc86f10b8a62cefe0029374b6ff · fixed in 9ad85bce62cadfdf4242f6e6bbff2a52e51d30f1; From b7c62d90c12c6cc86f10b8a62cefe0029374b6ff · fixed in c66e138af626cad4210da449996ae9e07ee63add; From b7c62d90c12c6cc86f10b8a62cefe0029374b6ff · fixed in ac9032882d673dd6679e1d873a2dc0131a1aeb43; From b7c62d90c12c6cc86f10b8a62cefe0029374b6ff · fixed in 8e4ebb6afaa34bd2e8ce52da231003d24111c2d6

• Linux Linux

  6.10

• KernelLinux

  From 6.10.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7

References 4