From a7a5816b965d31cf3b1fb08e61a144b6a27bb5f7 Mon Sep 17 00:00:00 2001
From: Puyan Lotfi <puyan@puyan.org>
Date: Tue, 4 Sep 2018 01:57:30 +0000
Subject: [PATCH] [NFC][llvm-objcopy] Fixing a ubi-san problem with unaligned
 memory writes.

llvm-svn: 341343
---
 llvm/tools/llvm-objcopy/Object.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/llvm/tools/llvm-objcopy/Object.cpp b/llvm/tools/llvm-objcopy/Object.cpp
index d8e90fd..e7ffb1e 100644
--- a/llvm/tools/llvm-objcopy/Object.cpp
+++ b/llvm/tools/llvm-objcopy/Object.cpp
@@ -153,9 +153,10 @@ void ELFSectionWriter<ELFT>::visit(const CompressedSection &Sec) {
     ArrayRef<uint8_t> Magic = {'Z', 'L', 'I', 'B'};
     std::copy(Magic.begin(), Magic.end(), Buf);
     Buf += Magic.size();
-    uint64_t *DecompressedSizePtr = reinterpret_cast<uint64_t *>(Buf);
-    *DecompressedSizePtr = support::endian::read64be(&Sec.DecompressedSize);
-    Buf += sizeof(Sec.DecompressedSize);
+    const uint64_t DecompressedSize =
+        support::endian::read64be(&Sec.DecompressedSize);
+    memcpy(Buf, &DecompressedSize, sizeof(DecompressedSize));
+    Buf += sizeof(DecompressedSize);
   } else {
     auto Chdr = reinterpret_cast<Elf_Chdr_Impl<ELFT> *>(Buf);
     Chdr->ch_type = ELF::ELFCOMPRESS_ZLIB;
-- 
2.7.4