From 06cdc35c5a993440a0b61f6e29f6ccbf4ff608ff Mon Sep 17 00:00:00 2001
From: iamcheeseman <dev@iamcheeseman.net>
Date: Mon, 11 May 2026 21:25:44 -0400
Subject: detect double frees

---
 teensy/teensy_mem.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

(limited to 'teensy/teensy_mem.c')

diff --git a/teensy/teensy_mem.c b/teensy/teensy_mem.c
index 735cf55..62088b8 100644
--- a/teensy/teensy_mem.c
+++ b/teensy/teensy_mem.c
@@ -144,19 +144,29 @@ void *ty_realloc(void *ptr, size_t new_size)
 
 void ty_free(void *ptr)
 {
-    free(ptr);
-
 #ifdef TEENSY_DEBUG
+    bool double_free = true;
+
     for (int i = 0; i < allocations_len; i++) {
         struct alloc *alloc = &allocations[i];
         if (alloc->ptr == ptr) {
             free(alloc->backtrace);
             *alloc = allocations[allocations_len - 1];
             allocations_len--;
+            double_free = false;
             break;
         }
     }
+
+    if (double_free) {
+        ty_log_fatal(
+            TY_ERR_MEM,
+            "Double free or freed unowned memory (%p)",
+            ptr
+        );
+    }
 #endif // TEENSY_DEBUG
+    free(ptr);
 }
 
 int ty_alloc_count(void)
-- 
cgit v1.3-2-g0d8e