From 82ede2f136cdadfb598437e20a9826a71707d674 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Mon, 21 Sep 2015 19:17:18 +0000
Subject: [PATCH] Avoid SEGFAULT if a requested symbol section is absent.

Patch by Igor Kudrin!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248194 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Object/readobj-absent.test  | 2 ++
 tools/llvm-readobj/ELFDumper.cpp | 2 ++
 2 files changed, 4 insertions(+)
 create mode 100644 test/Object/readobj-absent.test

diff --git a/test/Object/readobj-absent.test b/test/Object/readobj-absent.test
new file mode 100644
index 00000000000..0968f3c3102
--- /dev/null
+++ b/test/Object/readobj-absent.test
@@ -0,0 +1,2 @@
+// Don't crash if required information is absent
+RUN: llvm-readobj -dyn-symbols %p/Inputs/trivial-object-test.elf-x86-64
diff --git a/tools/llvm-readobj/ELFDumper.cpp b/tools/llvm-readobj/ELFDumper.cpp
index 31e200e436c..99311634403 100644
--- a/tools/llvm-readobj/ELFDumper.cpp
+++ b/tools/llvm-readobj/ELFDumper.cpp
@@ -1152,6 +1152,8 @@ void ELFDumper<ELFT>::printRelocation(Elf_Rela Rel, const Elf_Shdr *SymTab) {
 template<class ELFT>
 void ELFDumper<ELFT>::printSymbolsHelper(bool IsDynamic) {
   const Elf_Shdr *Symtab = (IsDynamic) ? DotDynSymSec : DotSymtabSec;
+  if (!Symtab)
+    return;
   ErrorOr<StringRef> StrTableOrErr = Obj->getStringTableForSymtab(*Symtab);
   error(StrTableOrErr.getError());
   StringRef StrTable = *StrTableOrErr;