[PATCH] D77584: [X86] Fix to X86LoadValueInjectionRetHardeningPass for possible segfault

[Craig Topper via Phabricator via llvm-commits]

This revision was not accepted when it landed; it landed in state "Needs Review".
This revision was automatically updated to reflect the committed changes.
Closed by commit rG0505181006f1: [X86] Fix to X86LoadValueInjectionRetHardeningPass for possible segfault (authored by sconstab, committed by craig.topper).
Herald added a project: LLVM.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D77584/new/

https://reviews.llvm.org/D77584

Files:
  llvm/lib/Target/X86/X86LoadValueInjectionRetHardening.cpp


Index: llvm/lib/Target/X86/X86LoadValueInjectionRetHardening.cpp
===================================================================
--- llvm/lib/Target/X86/X86LoadValueInjectionRetHardening.cpp
+++ llvm/lib/Target/X86/X86LoadValueInjectionRetHardening.cpp
@@ -99,6 +99,9 @@
 
   bool Modified = false;
   for (auto &MBB : MF) {
+    if (MBB.empty())
+      continue;
+
     MachineInstr &MI = MBB.back();
     if (MI.getOpcode() != X86::RETQ)
       continue;


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