diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index b799f11e45dc..2e973b36fe07 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -466,18 +466,6 @@ static inline void kasan_unpoison(const void *addr, size_t size, bool init)
 
 	if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
 		return;
-	/*
-	 * Explicitly initialize the memory with the precise object size to
-	 * avoid overwriting the slab redzone. This disables initialization in
-	 * the arch code and may thus lead to performance penalty. This penalty
-	 * does not affect production builds, as slab redzones are not enabled
-	 * there.
-	 */
-	if (__slub_debug_enabled() &&
-	    init && ((unsigned long)size & KASAN_GRANULE_MASK)) {
-		init = false;
-		memzero_explicit((void *)addr, size);
-	}
 	size = round_up(size, KASAN_GRANULE_SIZE);
 
 	hw_set_mem_tag_range((void *)addr, size, tag, init);
diff --git a/mm/slab.h b/mm/slab.h
index f01ac256a8f5..24ecd4f50b57 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -684,6 +684,7 @@ static inline void slab_post_alloc_hook(struct kmem_cache *s,
 					unsigned int orig_size)
 {
 	unsigned int zero_size = s->object_size;
+	bool kasan_init = init;
 	size_t i;
 
 	flags &= gfp_allowed_mask;
@@ -700,6 +701,17 @@ static inline void slab_post_alloc_hook(struct kmem_cache *s,
 	    (s->flags & SLAB_KMALLOC))
 		zero_size = orig_size;
 
+	/*
+	 * When slub_debug is enabled, avoid memory initialization integrated
+	 * into KASAN and instead zero out the memory via the memset below with
+	 * the proper size. Otherwise, KASAN might overwrite SLUB redzones and
+	 * cause false-positive reports. This does not lead to a performance
+	 * penalty on production builds, as slub_debug is not intended to be
+	 * enabled there.
+	 */
+	if (__slub_debug_enabled())
+		kasan_init = false;
+
 	/*
 	 * As memory initialization might be integrated into KASAN,
 	 * kasan_slab_alloc and initialization memset must be
@@ -708,8 +720,8 @@ static inline void slab_post_alloc_hook(struct kmem_cache *s,
 	 * As p[i] might get tagged, memset and kmemleak hook come after KASAN.
 	 */
 	for (i = 0; i < size; i++) {
-		p[i] = kasan_slab_alloc(s, p[i], flags, init);
-		if (p[i] && init && !kasan_has_integrated_init())
+		p[i] = kasan_slab_alloc(s, p[i], flags, kasan_init);
+		if (p[i] && init && (!kasan_init || !kasan_has_integrated_init()))
 			memset(p[i], 0, zero_size);
 		kmemleak_alloc_recursive(p[i], s->object_size, 1,
 					 s->flags, flags);