[llvm] r265866 - [libfuzzer] defensive assert

[Mike Aizatsky via llvm-commits]

Author: aizatsky
Date: Fri Apr  8 18:32:24 2016
New Revision: 265866

URL: http://llvm.org/viewvc/llvm-project?rev=265866&view=rev
Log:
[libfuzzer] defensive assert

Modified:
    llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp

Modified: llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp?rev=265866&r1=265865&r2=265866&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp (original)
+++ llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp Fri Apr  8 18:32:24 2016
@@ -503,8 +503,9 @@ void Fuzzer::MutateAndTestOne() {
 
   auto &U = ChooseUnitToMutate();
   MutateInPlaceHere.resize(Options.MaxLen);
-  memcpy(MutateInPlaceHere.data(), U.data(), U.size());
   size_t Size = U.size();
+  assert(Size <= Options.MaxLen && "Oversized Unit");
+  memcpy(MutateInPlaceHere.data(), U.data(), Size);
 
   for (int i = 0; i < Options.MutateDepth; i++) {
     size_t NewSize = 0;