[libFuzzer] don't crash if the condition in a switch has unusual type (e.g. i72)

llvm-svn: 244544

2 files changed, 27 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp b/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
index c91b89df830..b6829aef2d5 100644
--- a/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
+++ b/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
@@ -375,6 +375,9 @@ void SanitizerCoverageModule::InjectTraceForSwitch(
       IRBuilder<> IRB(I);
       SmallVector<Constant *, 16> Initializers;
       Value *Cond = SI->getCondition();
+      if (Cond->getType()->getScalarSizeInBits() >
+          Int64Ty->getScalarSizeInBits())
+        continue;
       Initializers.push_back(ConstantInt::get(Int64Ty, SI->getNumCases()));
       Initializers.push_back(
           ConstantInt::get(Int64Ty, Cond->getType()->getScalarSizeInBits()));
diff --git a/llvm/test/Instrumentation/SanitizerCoverage/switch-tracing.ll b/llvm/test/Instrumentation/SanitizerCoverage/switch-tracing.ll
index 9ad1c7acf63..aac56dbdeb7 100644
--- a/llvm/test/Instrumentation/SanitizerCoverage/switch-tracing.ll
+++ b/llvm/test/Instrumentation/SanitizerCoverage/switch-tracing.ll
@@ -30,3 +30,27 @@ sw.bb.2:                                          ; preds = %entry
 sw.epilog:                                        ; preds = %entry, %sw.bb.2, %sw.bb.1, %sw.bb
   ret void
 }
+
+define void @fooi72(i72 %x) {
+entry:
+  switch i72 %x, label %sw.epilog [
+    i72 1, label %sw.bb
+    i72 101, label %sw.bb.1
+    i72 1001, label %sw.bb.2
+  ]
+
+sw.bb:                                            ; preds = %entry
+  tail call void @_Z3bari(i32 4)
+  br label %sw.epilog
+
+sw.bb.1:                                          ; preds = %entry
+  tail call void @_Z3bari(i32 5)
+  br label %sw.epilog
+
+sw.bb.2:                                          ; preds = %entry
+  tail call void @_Z3bari(i32 6)
+  br label %sw.epilog
+
+sw.epilog:                                        ; preds = %entry, %sw.bb.2, %sw.bb.1, %sw.bb
+  ret void
+}