diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 9cba4d66b721..f31b60e75ff1 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -422,12 +422,13 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end,
 			   unsigned long free_region_start,
 			   unsigned long free_region_end);
 
-void __kasan_unpoison_vmalloc(const void *start, unsigned long size);
-static __always_inline void kasan_unpoison_vmalloc(const void *start,
-						   unsigned long size)
+void *__kasan_unpoison_vmalloc(const void *start, unsigned long size);
+static __always_inline void *kasan_unpoison_vmalloc(const void *start,
+						    unsigned long size)
 {
 	if (kasan_enabled())
-		__kasan_unpoison_vmalloc(start, size);
+		return __kasan_unpoison_vmalloc(start, size);
+	return (void *)start;
 }
 
 void __kasan_poison_vmalloc(const void *start, unsigned long size);
@@ -452,8 +453,11 @@ static inline void kasan_release_vmalloc(unsigned long start,
 					 unsigned long free_region_start,
 					 unsigned long free_region_end) { }
 
-static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size)
-{ }
+static inline void *kasan_unpoison_vmalloc(const void *start,
+					   unsigned long size)
+{
+	return (void *)start;
+}
 static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
 { }
 
diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
index 5c865307b76d..39f92b065a72 100644
--- a/mm/kasan/shadow.c
+++ b/mm/kasan/shadow.c
@@ -470,12 +470,14 @@ void kasan_release_vmalloc(unsigned long start, unsigned long end,
 	}
 }
 
-void __kasan_unpoison_vmalloc(const void *start, unsigned long size)
+void *__kasan_unpoison_vmalloc(const void *start, unsigned long size)
 {
 	if (!is_vmalloc_or_module_addr(start))
-		return;
+		return (void *)start;
 
+	start = set_tag(start, kasan_random_tag());
 	kasan_unpoison(start, size, false);
+	return (void *)start;
 }
 
 /*
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 58abed2b907c..4de9486873c1 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2210,7 +2210,7 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node)
 		mem = (void *)addr;
 	}
 
-	kasan_unpoison_vmalloc(mem, size);
+	mem = kasan_unpoison_vmalloc(mem, size);
 
 	if (vmap_pages_range(addr, addr + size, PAGE_KERNEL,
 				pages, PAGE_SHIFT) < 0) {
@@ -2436,10 +2436,10 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
 		return NULL;
 	}
 
-	kasan_unpoison_vmalloc((void *)va->va_start, requested_size);
-
 	setup_vmalloc_vm(area, va, flags, caller);
 
+	area->addr = kasan_unpoison_vmalloc(area->addr, requested_size);
+
 	return area;
 }
 
@@ -3721,9 +3721,6 @@ retry:
 	for (area = 0; area < nr_vms; area++) {
 		if (kasan_populate_vmalloc(vas[area]->va_start, sizes[area]))
 			goto err_free_shadow;
-
-		kasan_unpoison_vmalloc((void *)vas[area]->va_start,
-				       sizes[area]);
 	}
 
 	/* insert all vm's */
@@ -3736,6 +3733,11 @@ retry:
 	}
 	spin_unlock(&vmap_area_lock);
 
+	/* mark allocated areas as accessible */
+	for (area = 0; area < nr_vms; area++)
+		vms[area]->addr = kasan_unpoison_vmalloc(vms[area]->addr,
+							 vms[area]->size);
+
 	kfree(vas);
 	return vms;