1 files changed, 7 insertions, 0 deletions
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index 71ae070b80c6..662212d103b5 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -187,6 +187,13 @@ bool check_memory_region(unsigned long addr, size_t size, bool write,
 	return check_memory_region_inline(addr, size, write, ret_ip);
 }
 
+bool check_invalid_free(void *addr)
+{
+	s8 shadow_byte = READ_ONCE(*(s8 *)kasan_mem_to_shadow(addr));
+
+	return shadow_byte < 0 || shadow_byte >= KASAN_GRANULE_SIZE;
+}
+
 void kasan_cache_shrink(struct kmem_cache *cache)
 {
 	quarantine_remove_cache(cache);