kasan: move kasan_mempool_poison_object

Move kasan_mempool_poison_object after all slab-related KASAN hooks.

This is a preparatory change for the following patches in this series.

No functional changes.

Link: https://lkml.kernel.org/r/23ea215409f43c13cdf9ecc454501a264c107d67.1703024586.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <[email protected]>
Cc: Alexander Lobakin <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Breno Leitao <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Evgenii Stepanov <[email protected]>
Cc: Marco Elver <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: xairy

include/linux/kasan.h

@@ -172,13 +172,6 @@ static __always_inline void kasan_kfree_large(void *ptr)
 		__kasan_kfree_large(ptr, _RET_IP_);
 }
 
-void __kasan_mempool_poison_object(void *ptr, unsigned long ip);
-static __always_inline void kasan_mempool_poison_object(void *ptr)
-{
-	if (kasan_enabled())
-		__kasan_mempool_poison_object(ptr, _RET_IP_);
-}
-
 void * __must_check __kasan_slab_alloc(struct kmem_cache *s,
 				       void *object, gfp_t flags, bool init);
 static __always_inline void * __must_check kasan_slab_alloc(
@@ -219,6 +212,13 @@ static __always_inline void * __must_check kasan_krealloc(const void *object,
 	return (void *)object;
 }
 
+void __kasan_mempool_poison_object(void *ptr, unsigned long ip);
+static __always_inline void kasan_mempool_poison_object(void *ptr)
+{
+	if (kasan_enabled())
+		__kasan_mempool_poison_object(ptr, _RET_IP_);
+}
+
 /*
  * Unlike kasan_check_read/write(), kasan_check_byte() is performed even for
  * the hardware tag-based mode that doesn't rely on compiler instrumentation.
@@ -256,7 +256,6 @@ static inline bool kasan_slab_free(struct kmem_cache *s, void *object, bool init
 	return false;
 }
 static inline void kasan_kfree_large(void *ptr) {}
-static inline void kasan_mempool_poison_object(void *ptr) {}
 static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
 				   gfp_t flags, bool init)
 {
@@ -276,6 +275,7 @@ static inline void *kasan_krealloc(const void *object, size_t new_size,
 {
 	return (void *)object;
 }
+static inline void kasan_mempool_poison_object(void *ptr) {}
 static inline bool kasan_check_byte(const void *address)
 {
 	return true;

mm/kasan/common.c

@@ -282,29 +282,6 @@ void __kasan_kfree_large(void *ptr, unsigned long ip)
 	____kasan_kfree_large(ptr, ip);
 }
 
-void __kasan_mempool_poison_object(void *ptr, unsigned long ip)
-{
-	struct folio *folio;
-
-	folio = virt_to_folio(ptr);
-
-	/*
-	 * Even though this function is only called for kmem_cache_alloc and
-	 * kmalloc backed mempool allocations, those allocations can still be
-	 * !PageSlab() when the size provided to kmalloc is larger than
-	 * KMALLOC_MAX_SIZE, and kmalloc falls back onto page_alloc.
-	 */
-	if (unlikely(!folio_test_slab(folio))) {
-		if (____kasan_kfree_large(ptr, ip))
-			return;
-		kasan_poison(ptr, folio_size(folio), KASAN_PAGE_FREE, false);
-	} else {
-		struct slab *slab = folio_slab(folio);
-
-		____kasan_slab_free(slab->slab_cache, ptr, ip, false, false);
-	}
-}
-
 void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
 					void *object, gfp_t flags, bool init)
 {
@@ -452,6 +429,29 @@ void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flag
 		return ____kasan_kmalloc(slab->slab_cache, object, size, flags);
 }
 
+void __kasan_mempool_poison_object(void *ptr, unsigned long ip)
+{
+	struct folio *folio;
+
+	folio = virt_to_folio(ptr);
+
+	/*
+	 * Even though this function is only called for kmem_cache_alloc and
+	 * kmalloc backed mempool allocations, those allocations can still be
+	 * !PageSlab() when the size provided to kmalloc is larger than
+	 * KMALLOC_MAX_SIZE, and kmalloc falls back onto page_alloc.
+	 */
+	if (unlikely(!folio_test_slab(folio))) {
+		if (____kasan_kfree_large(ptr, ip))
+			return;
+		kasan_poison(ptr, folio_size(folio), KASAN_PAGE_FREE, false);
+	} else {
+		struct slab *slab = folio_slab(folio);
+
+		____kasan_slab_free(slab->slab_cache, ptr, ip, false, false);
+	}
+}
+
 bool __kasan_check_byte(const void *address, unsigned long ip)
 {
 	if (!kasan_byte_accessible(address)) {