[llvm] r294378 - [libFuzzer] Update Load test to work on 32 bits.

[Marcos Pividori via llvm-commits]

Author: mpividori
Date: Tue Feb  7 18:02:32 2017
New Revision: 294378

URL: http://llvm.org/viewvc/llvm-project?rev=294378&view=rev
Log:
[libFuzzer] Update Load test to work on 32 bits.

We should ensure the size of the variable `a` is 8 bytes. Otherwise, this
generates a stack buffer overflow inside the memcpy call in 32 bits machines.
(We write more bytes than the size of a, when it is 4 bytes)

Differential Revision: https://reviews.llvm.org/D29602

Modified:
    llvm/trunk/lib/Fuzzer/test/LoadTest.cpp

Modified: llvm/trunk/lib/Fuzzer/test/LoadTest.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/LoadTest.cpp?rev=294378&r1=294377&r2=294378&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/test/LoadTest.cpp (original)
+++ llvm/trunk/lib/Fuzzer/test/LoadTest.cpp Tue Feb  7 18:02:32 2017
@@ -14,7 +14,7 @@ int array[kArraySize];
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
   if (Size < 8) return 0;
-  size_t a = 0;
+  uint64_t a = 0;
   memcpy(&a, Data, 8);
   Sink = array[a % (kArraySize + 1)];
   return 0;