12-custom-mutator-fail.patch

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commit bde6e34b41ab68663a1c07a555432ecbd7358a55

Author: Christian Holler <choller@mozilla.com>

Date:   Thu Jul 30 18:32:48 2020 +0200

    [libFuzzer] Allow custom mutators to fail

diff --git a/FuzzerLoop.cpp b/FuzzerLoop.cpp

index 4339cf2e0dbb..263140c99f57 100644

--- a/FuzzerLoop.cpp

+++ b/FuzzerLoop.cpp

@@ -754,6 +754,10 @@ void Fuzzer::MutateAndTestOne() {

     // If MutateWithMask either failed or wasn't called, call default Mutate.

     if (!NewSize)

       NewSize = MD.Mutate(CurrentUnitData, Size, CurrentMaxMutationLen);

+    if (!NewSize)

+      continue;

     assert(NewSize > 0 && "Mutator returned empty unit");

     assert(NewSize <= CurrentMaxMutationLen && "Mutator return oversized unit");

     Size = NewSize;

@@ -923,7 +927,9 @@ void Fuzzer::MinimizeCrashLoop(const Unit &U) {

     memcpy(CurrentUnitData, U.data(), U.size());

     for (int i = 0; i < Options.MutateDepth; i++) {

       size_t NewSize = MD.Mutate(CurrentUnitData, U.size(), MaxMutationLen);

-      assert(NewSize > 0 && NewSize <= MaxMutationLen);

+      assert(NewSize <= MaxMutationLen);

+      if (!NewSize)

+        continue;

       ExecuteCallback(CurrentUnitData, NewSize);

       PrintPulseAndReportSlowInput(CurrentUnitData, NewSize);

       TryDetectingAMemoryLeak(CurrentUnitData, NewSize,