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| author | Scott Constable <scott.d.constable@intel.com> | 2020-04-10 17:32:39 -0700 |
|---|---|---|
| committer | Tom Stellard <tstellar@redhat.com> | 2020-06-24 09:31:04 -0700 |
| commit | ac40e7a02efbadd5c91d2fec85aac29ab9a6af18 (patch) | |
| tree | dc02a455d8e36fb826680e399a2068558a385f37 /llvm/lib | |
| parent | d758416a9152a9c7e41671493ae4f77a0dfc1993 (diff) | |
| download | bcm5719-llvm-ac40e7a02efbadd5c91d2fec85aac29ab9a6af18.tar.gz bcm5719-llvm-ac40e7a02efbadd5c91d2fec85aac29ab9a6af18.zip | |
[X86] Fix to X86LoadValueInjectionRetHardeningPass for possible segfault
`MBB.back()` could segfault if `MBB.empty()`. Fixed by checking for `MBB.empty()` in the loop.
Differential Revision: https://reviews.llvm.org/D77584
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/X86LoadValueInjectionRetHardening.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86LoadValueInjectionRetHardening.cpp b/llvm/lib/Target/X86/X86LoadValueInjectionRetHardening.cpp index 9c36e86099f..6e1134a2595 100644 --- a/llvm/lib/Target/X86/X86LoadValueInjectionRetHardening.cpp +++ b/llvm/lib/Target/X86/X86LoadValueInjectionRetHardening.cpp @@ -99,6 +99,9 @@ bool X86LoadValueInjectionRetHardeningPass::runOnMachineFunction( bool Modified = false; for (auto &MBB : MF) { + if (MBB.empty()) + continue; + MachineInstr &MI = MBB.back(); if (MI.getOpcode() != X86::RETQ) continue; |
