mm/kasan: add null pointer access configuration

Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>

mm/Kconfig

@@ -288,6 +288,12 @@ config MM_KASAN_ALL
 		to check. Enabling this option will get image size increased
 		and performance decreased significantly.
 
+config MM_KASAN_DISABLE_NULL_POINTER_CHECK
+	bool "Disable null pointer access check"
+	default n
+	---help---
+		This option enables KASan check null pointer access.
+
 config MM_KASAN_DISABLE_READS_CHECK
 	bool "Disable reads check"
 	depends on MM_KASAN

mm/kasan/hook.c

@@ -173,10 +173,12 @@ static inline void kasan_check_report(FAR const void *addr, size_t size,
       return;
     }
 
+#ifndef CONFIG_MM_KASAN_DISABLE_NULL_POINTER_CHECK
   if (addr == NULL)
     {
       kasan_report(addr, size, is_write, return_address);
     }
+#endif
 
   if (kasan_is_poisoned(addr, size))
     {