From c6db3cc6709bf53d0bbfafab66769175e9a871ae Mon Sep 17 00:00:00 2001
From: alessio98888 <56458281+alessio98888@users.noreply.github.com>
Date: Sat, 16 Aug 2025 19:50:06 +0200
Subject: [PATCH] Fix buddy allocator assert

The last address of "data" is not "cast(uintptr)raw_data(data)+cast(uintptr)size" but
"cast(uintptr)raw_data(data)+cast(uintptr)(size-1)".

The original assert would fail when for example the allocation size requested and the buddy allocator allignment were both 64.
---
 core/mem/allocators.odin | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/mem/allocators.odin b/core/mem/allocators.odin
index cb9301f60..2d7e7b3ea 100644
--- a/core/mem/allocators.odin
+++ b/core/mem/allocators.odin
@@ -2331,7 +2331,7 @@ buddy_allocator_alloc_bytes_non_zeroed :: proc(b: ^Buddy_Allocator, size: uint)
 		}
 		found.is_free = false
 		data := ([^]byte)(found)[b.alignment:][:size]
-		assert(cast(uintptr)raw_data(data)+cast(uintptr)size < cast(uintptr)buddy_block_next(found), "Buddy_Allocator has made an allocation which overlaps a block header.")
+		assert(cast(uintptr)raw_data(data)+cast(uintptr)(size-1) < cast(uintptr)buddy_block_next(found), "Buddy_Allocator has made an allocation which overlaps a block header.")
 		// ensure_poisoned(data)
 		// sanitizer.address_unpoison(data)
 		return data, nil