From 7e77bd425f91be572644a6be8f1d1627a0fee7d1 Mon Sep 17 00:00:00 2001
From: Feoramund <161657516+Feoramund@users.noreply.github.com>
Date: Sun, 15 Jun 2025 07:29:51 -0400
Subject: [PATCH] mem: Guard against size 0 in `dynamic_arena_resize_*`

---
 core/mem/allocators.odin | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/core/mem/allocators.odin b/core/mem/allocators.odin
index 300b82d47..e0d3b323c 100644
--- a/core/mem/allocators.odin
+++ b/core/mem/allocators.odin
@@ -1912,6 +1912,10 @@ dynamic_arena_resize_bytes :: proc(
 	size:     int,
 	loc := #caller_location,
 ) -> ([]byte, Allocator_Error) {
+	if size == 0 {
+		// NOTE: This allocator has no Free mode.
+		return nil, nil
+	}
 	bytes, err := dynamic_arena_resize_bytes_non_zeroed(a, old_data, size, loc)
 	if bytes != nil {
 		if old_data == nil {
@@ -1968,6 +1972,10 @@ dynamic_arena_resize_bytes_non_zeroed :: proc(
 	size:     int,
 	loc := #caller_location,
 ) -> ([]byte, Allocator_Error) {
+	if size == 0 {
+		// NOTE: This allocator has no Free mode.
+		return nil, nil
+	}
 	old_memory := raw_data(old_data)
 	old_size := len(old_data)
 	if old_size >= size {