[llvm-reduce] Exit when input module is malformed

The parseInputFile function returns an empty unique_ptr to signal an
error, like when the input file doesn't exist, or is malformed. In this
case, the tool should exit immediately rather than segfault by
dereferencing the unique_ptr later.

Reviewed By: aeubanks

Differential Revision: https://reviews.llvm.org/D102891

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/tools/llvm-reduce/llvm-reduce.cpp b/llvm/tools/llvm-reduce/llvm-reduce.cpp
index 5a00ef0..614ca45 100644
--- a/llvm/tools/llvm-reduce/llvm-reduce.cpp
+++ b/llvm/tools/llvm-reduce/llvm-reduce.cpp
@@ -116,6 +116,10 @@ int main(int Argc, char **Argv) {
   std::unique_ptr<Module> OriginalProgram =
       parseInputFile(InputFilename, Context);
 
+  if (!OriginalProgram) {
+    return 1;
+  }
+
   // Initialize test environment
   TestRunner Tester(TestFilename, TestArguments);
   Tester.setProgram(std::move(OriginalProgram));