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-rw-r--r--mm/kasan/common.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 8a3d66393dc5..1e510649833b 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -476,7 +476,7 @@ static void *____kasan_kmalloc(struct kmem_cache *cache, const void *object,
/*
* The object has already been unpoisoned by kasan_slab_alloc() for
- * kmalloc() or by ksize() for krealloc().
+ * kmalloc() or by kasan_krealloc() for krealloc().
*/
/*
@@ -526,7 +526,7 @@ void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size,
/*
* The object has already been unpoisoned by kasan_alloc_pages() for
- * alloc_pages() or by ksize() for krealloc().
+ * alloc_pages() or by kasan_krealloc() for krealloc().
*/
/*
@@ -554,8 +554,16 @@ void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flag
if (unlikely(object == ZERO_SIZE_PTR))
return (void *)object;
+ /*
+ * Unpoison the object's data.
+ * Part of it might already have been unpoisoned, but it's unknown
+ * how big that part is.
+ */
+ kasan_unpoison(object, size);
+
page = virt_to_head_page(object);
+ /* Piggy-back on kmalloc() instrumentation to poison the redzone. */
if (unlikely(!PageSlab(page)))
return __kasan_kmalloc_large(object, size, flags);
else