[llvm] r290634 - [libFuzzer] don't create large random mutations when given an empty seed

[Kostya Serebryany via llvm-commits]

Author: kcc
Date: Tue Dec 27 16:15:04 2016
New Revision: 290634

URL: http://llvm.org/viewvc/llvm-project?rev=290634&view=rev
Log:
[libFuzzer] don't create large random mutations when given an empty seed

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

Modified: llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp?rev=290634&r1=290633&r2=290634&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp (original)
+++ llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp Tue Dec 27 16:15:04 2016
@@ -486,7 +486,7 @@ size_t MutationDispatcher::MutateImpl(ui
                                       const std::vector<Mutator> &Mutators) {
   assert(MaxSize > 0);
   if (Size == 0) {
-    for (size_t i = 0; i < MaxSize; i++)
+    for (size_t i = 0; i < Min(size_t(4), MaxSize); i++)
       Data[i] = RandCh(Rand);
     if (Options.OnlyASCII)
       ToASCII(Data, MaxSize);