From b315442b947dbf4909ca03e4fff2548493ceff9c Mon Sep 17 00:00:00 2001
From: "Douglas B. Rumbaugh" <doug@douglasrumbaugh.com>
Date: Sun, 2 Nov 2025 18:29:43 -0500
Subject: free_list: Update header sizes when coalescing free blocks

---
 src/free_list.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/free_list.c b/src/free_list.c
index 0ecb23f..bc93196 100644
--- a/src/free_list.c
+++ b/src/free_list.c
@@ -60,6 +60,7 @@ void fl_coalesce_nodes(free_nd *free_list) {
   for (free_nd *nd = free_list; nd; nd = nd->next) {
     if ((size_t)nd + sizeof(header) + nd->size == (size_t)nd->next) {
       nd->size += sizeof(header) + nd->next->size;
+      ((header *)((void *)nd - sizeof(header)))->size += sizeof(header) + nd->next->size;
       nd->next = nd->next->next;
     }
   }
-- 
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