From 4e6d57e3717d68f99b0a96f5e0cc6a17396dbba4 Mon Sep 17 00:00:00 2001
From: Evgeny <me@jeka.su>
Date: Sat, 30 May 2026 20:03:33 +0300
Subject: [PATCH] clear freed memory in u_free_impl to catch UAF earlier

---
 lib/mem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/mem.c b/lib/mem.c
index 5fcc3c58..9f9f6159 100644
--- a/lib/mem.c
+++ b/lib/mem.c
@@ -233,6 +233,8 @@ void u_free_impl(void* ptr, const char* location) {
 #endif
         exit(EXIT_FAILURE);
     }
+    uint32_t total = size + 12 + 2 * BOUNDARY_CHECK_SIZE + METADATA_SIZE;
+    memset(base, 0, total);
     free(base);
 }