From 70c91f4c3e553bc37e146c9c545a186e4ec02054 Mon Sep 17 00:00:00 2001
From: Dmitry Muhomor <muhomor.dmitry@gmail.com>
Date: Thu, 26 Oct 2023 10:17:21 +0300
Subject: [PATCH] mte: disable write-after-free check for slab allocations when
 MTE is on

Freed slab memory is tagged with a reserved tag value that is never used for live allocations.
---
 h_malloc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/h_malloc.c b/h_malloc.c
index 098eb37..fc36ad7 100644
--- a/h_malloc.c
+++ b/h_malloc.c
@@ -464,6 +464,12 @@ static void write_after_free_check(const char *p, size_t size) {
         return;
     }
 
+#ifdef HAS_ARM_MTE
+    if (likely(is_memtag_enabled())) {
+        return;
+    }
+#endif
+
     for (size_t i = 0; i < size; i += sizeof(u64)) {
         if (unlikely(*(const u64 *)(const void *)(p + i))) {
             fatal_error("detected write after free");