From e991ffd37bba5b06f79db4bdcc48a62ee3dacd14 Mon Sep 17 00:00:00 2001
From: Ryan Macnak <rmacnak@google.com>
Date: Wed, 27 May 2026 12:55:21 -0700
Subject: [PATCH] [vm] Fix HashBytes to work with unaligned inputs.

TEST=ubsan
Bug: https://github.com/dart-lang/sdk/issues/63452
Change-Id: I112b26c08b5ae186dc5264d99edbed9e6e60368d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/506660
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>
---
 runtime/vm/hash.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/runtime/vm/hash.h b/runtime/vm/hash.h
index ceae2b7180c..2762c5537a8 100644
--- a/runtime/vm/hash.h
+++ b/runtime/vm/hash.h
@@ -6,6 +6,7 @@
 #define RUNTIME_VM_HASH_H_
 
 #include "platform/globals.h"
+#include "platform/unaligned.h"
 
 namespace dart {
 
@@ -41,7 +42,8 @@ inline uint32_t HashBytes(const void* bytes,
   uint32_t hash = len;
   const intptr_t chunks = len / kInt32Size;
   for (intptr_t i = 0; i < chunks; i++) {
-    hash = CombineHashes(hash, reinterpret_cast<const uint32_t*>(bytes)[i]);
+    hash = CombineHashes(
+        hash, LoadUnaligned(&(reinterpret_cast<const uint32_t*>(bytes)[i])));
   }
   for (intptr_t i = chunks * kInt32Size; i < len; i++) {
     hash = CombineHashes(hash, reinterpret_cast<const uint8_t*>(bytes)[i]);