From a66d9582a16eb3c15bf727db84431660ae20b2f2 Mon Sep 17 00:00:00 2001
From: "Douglas B. Rumbaugh" <doug@douglasrumbaugh.com>
Date: Sun, 2 Nov 2025 15:41:54 -0500
Subject: alloc.c: releasing NULL now works

My initial free list implementation revealed a
bug that I wasn't handling release(NULL) correctly,
resulting in a segfault.

After this commit, all existing tests pass for
liballoc.
---
 src/alloc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/alloc.c b/src/alloc.c
index 830e49f..2f4aa03 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -76,6 +76,10 @@ void *allocate(size_t size) {
 }
 
 void release(void *ptr) {
+  if (!ptr) {
+    return;
+  }
+
   fl_add_node(&free_list, ptr);
   fl_coalesce_nodes(free_list);
 }
-- 
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