From aa41a77fc44db838c15aadbd405a11d26c5ddb80 Mon Sep 17 00:00:00 2001
From: Feoramund <161657516+Feoramund@users.noreply.github.com>
Date: Sat, 14 Jun 2025 13:08:50 -0400
Subject: [PATCH] mem: Check if `alignment` matches on `Small_Stack` resize

---
 core/mem/allocators.odin | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/core/mem/allocators.odin b/core/mem/allocators.odin
index 30c2589e7..200f15883 100644
--- a/core/mem/allocators.odin
+++ b/core/mem/allocators.odin
@@ -1550,6 +1550,16 @@ small_stack_resize_bytes_non_zeroed :: proc(
 		// NOTE(bill): Treat as a double free
 		return nil, nil
 	}
+	if uintptr(old_memory) & uintptr(alignment-1) != 0 {
+		// A different alignment has been requested and the current address
+		// does not satisfy it.
+		data, err := small_stack_alloc_bytes_non_zeroed(s, size, alignment, loc)
+		if err == nil {
+			runtime.copy(data, byte_slice(old_memory, old_size))
+			sanitizer.address_poison(old_memory)
+		}
+		return data, err
+	}
 	if old_size == size {
 		result := byte_slice(old_memory, size)
 		sanitizer.address_unpoison(result)