[libFuzzer] make sure that 2-byte arguments of switch() are handled properly

[oota-llvm.git] / lib / Fuzzer / test / SwitchTest.cpp

diff --git a/lib/Fuzzer/test/SwitchTest.cpp b/lib/Fuzzer/test/SwitchTest.cpp
index 0f2319b2cc9ed44c00fd0d10ca6e563b7ac8a602..9f921fb6098628fc20363935c288836b19e8c281 100644 (file)
--- a/lib/Fuzzer/test/SwitchTest.cpp
+++ b/lib/Fuzzer/test/SwitchTest.cpp
@@ -25,9 +25,28 @@ bool Switch(const uint8_t *Data, size_t Size) {
   return false;
 }
 
   return false;
 }
 

+bool ShortSwitch(const uint8_t *Data, size_t Size) {
+  short X;
+  if (Size < sizeof(short)) return false;
+  memcpy(&X, Data, sizeof(short));
+  switch(X) {
+    case 42: Sink = __LINE__; break;
+    case 402: Sink = __LINE__; break;
+    case 4002: Sink = __LINE__; break;
+    case 5002: Sink = __LINE__; break;
+    case 7002: Sink = __LINE__; break;
+    case 9002: Sink = __LINE__; break;
+    case 14002: Sink = __LINE__; break;
+    case 21402: return true;
+  }
+  return false;
+}
+

 extern "C" void LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
 extern "C" void LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

-  if (Switch<int>(Data, Size) && Size >= 12 &&
-      Switch<uint64_t>(Data + 4, Size - 4)) {
+  if (Size >= 4  && Switch<int>(Data, Size) &&
+      Size >= 12 && Switch<uint64_t>(Data + 4, Size - 4) &&
+      Size >= 14 && ShortSwitch(Data + 12, 2)
+    ) {

     fprintf(stderr, "BINGO; Found the target, exiting\n");
     exit(1);
   }
     fprintf(stderr, "BINGO; Found the target, exiting\n");
     exit(1);
   }