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Merge tag 'slab-for-6.19-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

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Pull slab fix from Vlastimil Babka:

 - A stable fix for a missing tag reset that can happen in
   kfree_nolock() with KASAN+SLUB_TINY configs (Deepanshu Kartikey)

* tag 'slab-for-6.19-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
  mm/slub: reset KASAN tag in defer_free() before accessing freed memory
This commit is contained in:
Linus Torvalds
2025-12-20 11:24:42 -08:00
parent e4a3d52ab9 53ca00a19d
commit 44f9a00a44
1 changed files with 2 additions and 0 deletions
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2
mm/slub.c
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@@ -6539,6 +6539,8 @@ static void defer_free(struct kmem_cache *s, void *head)
guard(preempt)(); guard(preempt)();
head = kasan_reset_tag(head);
df = this_cpu_ptr(&defer_free_objects); df = this_cpu_ptr(&defer_free_objects);
if (llist_add(head + s->offset, &df->objects)) if (llist_add(head + s->offset, &df->objects))
irq_work_queue(&df->work); irq_work_queue(&df->work);