Merge tag 'slab-for-6.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

Pull slab fix from Vlastimil Babka:

 - Fix for potential infinite loop in kmalloc_nolock() when debugging
   is enabled for the cache (Vlastimil Babka)

* tag 'slab-for-6.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
  slab: prevent infinite loop in kmalloc_nolock() with debugging

Author: torvalds

mm/slub.c

@@ -4666,8 +4666,12 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
 	if (kmem_cache_debug(s)) {
 		freelist = alloc_single_from_new_slab(s, slab, orig_size, gfpflags);
 
-		if (unlikely(!freelist))
+		if (unlikely(!freelist)) {
+			/* This could cause an endless loop. Fail instead. */
+			if (!allow_spin)
+				return NULL;
 			goto new_objects;
+		}
 
 		if (s->flags & SLAB_STORE_USER)
 			set_track(s, freelist, TRACK_ALLOC, addr,