Add missing nullptr check to AArch64MachObjectWriter::recordRelocation

There was missing nullptr check before a call to getSection() in
recordRelocation. This would result in a segfault in code like the attached
test.

This adds the missing check and a test which makes sure we get the expected 
error output.

llvm-svn: 329716

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64MachObjectWriter.cpp b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64MachObjectWriter.cpp
index d52c58e47f9..a8e0d0563c7 100644
--- a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64MachObjectWriter.cpp
+++ b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64MachObjectWriter.cpp
@@ -305,7 +305,8 @@ void AArch64MachObjectWriter::recordRelocation(
 
     bool CanUseLocalRelocation =
         canUseLocalRelocation(Section, *Symbol, Log2Size);
-    if (Symbol->isTemporary() && (Value || !CanUseLocalRelocation)) {
+    if (Symbol->isTemporary() && Symbol->isInSection() &&
+        (Value || !CanUseLocalRelocation)) {
       const MCSection &Sec = Symbol->getSection();
       if (!Asm.getContext().getAsmInfo()->isSectionAtomizableBySymbols(Sec))
         Symbol->setUsedInReloc();