[llvm] r283021 - [libFuzzer] fix a recent bugs (buffer overflow)

[Kostya Serebryany via llvm-commits]

Author: kcc
Date: Sat Oct  1 02:13:25 2016
New Revision: 283021

URL: http://llvm.org/viewvc/llvm-project?rev=283021&view=rev
Log:
[libFuzzer] fix a recent bugs (buffer overflow)

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

Modified: llvm/trunk/lib/Fuzzer/FuzzerTracePC.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerTracePC.cpp?rev=283021&r1=283020&r2=283021&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerTracePC.cpp (original)
+++ llvm/trunk/lib/Fuzzer/FuzzerTracePC.cpp Sat Oct  1 02:13:25 2016
@@ -92,7 +92,7 @@ bool TracePC::FinalizeTrace(size_t Input
         else if (Counter >= 2) Bit = 1;
         size_t Feature = i * 8 + Bit;
         CounterMap.AddValue(Feature);
-        uint32_t *SizePtr = &InputSizesPerFeature[Feature];
+        uint32_t *SizePtr = &InputSizesPerFeature[Feature % kFeatureSetSize];
         if (!*SizePtr || *SizePtr > InputSize) {
           *SizePtr = InputSize;
           Res = true;