From: Rui Ueyama <ruiu@google.com>
Date: Sun, 29 Oct 2017 16:49:42 +0000 (+0000)
Subject: Fix ubsan error that shift amount 64 is too large.
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b6f4e722b1e82b25643239b33b773a22af166050;p=platform%2Fupstream%2Fllvm.git

Fix ubsan error that shift amount 64 is too large.

llvm-svn: 316863
---

diff --git a/lld/ELF/InputFiles.cpp b/lld/ELF/InputFiles.cpp
index 9b884d9..24ab052 100644
--- a/lld/ELF/InputFiles.cpp
+++ b/lld/ELF/InputFiles.cpp
@@ -763,7 +763,9 @@ template <class ELFT> void SharedFile<ELFT>::parseRest() {
     // files because the loader takes care of it. However, if we promote a
     // DSO symbol to point to .bss due to copy relocation, we need to keep
     // the original alignment requirements. We infer it here.
-    uint32_t Alignment = 1ULL << countTrailingZeros((uint64_t)Sym.st_value);
+    uint32_t Alignment = 1;
+    if (Sym.st_value)
+      Alignment = 1ULL << countTrailingZeros((uint64_t)Sym.st_value);
     if (0 < Sym.st_shndx && Sym.st_shndx < Sections.size()) {
       uint32_t SecAlign = Sections[Sym.st_shndx].sh_addralign;
       Alignment = std::min(Alignment, SecAlign);