kasan: use kasan_addr_to_slab in print_address_description

Use the kasan_addr_to_slab() helper in print_address_description() instead
of separately invoking PageSlab() and page_slab().

Link: https://lkml.kernel.org/r/8b744fbf8c3c7fc5d34329ec70b60ee5c8dba66c.1662411799.git.andreyknvl@google.comSigned-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/kasan/common.c

@@ -30,6 +30,13 @@
 #include "kasan.h"
 #include "../slab.h"
 
+struct slab *kasan_addr_to_slab(const void *addr)
+{
+	if (virt_addr_valid(addr))
+		return virt_to_slab(addr);
+	return NULL;
+}
+
 depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc)
 {
 	unsigned long entries[KASAN_STACK_DEPTH];

mm/kasan/report.c

@@ -213,13 +213,6 @@ struct page *kasan_addr_to_page(const void *addr)
 	return NULL;
 }
 
-struct slab *kasan_addr_to_slab(const void *addr)
-{
-	if (virt_addr_valid(addr))
-		return virt_to_slab(addr);
-	return NULL;
-}
-
 static void describe_object_addr(struct kmem_cache *cache, void *object,
 				const void *addr)
 {
@@ -297,12 +290,12 @@ static inline bool init_task_stack_addr(const void *addr)
 static void print_address_description(void *addr, u8 tag)
 {
 	struct page *page = kasan_addr_to_page(addr);
+	struct slab *slab = kasan_addr_to_slab(addr);
 
 	dump_stack_lvl(KERN_ERR);
 	pr_err("\n");
 
-	if (page && PageSlab(page)) {
-		struct slab *slab = page_slab(page);
+	if (slab) {
 		struct kmem_cache *cache = slab->slab_cache;
 		void *object = nearest_obj(cache, slab,	addr);