1 files changed, 6 insertions, 2 deletions

diff --git a/contrib/llvm-project/compiler-rt/lib/fuzzer/FuzzerMerge.cpp b/contrib/llvm-project/compiler-rt/lib/fuzzer/FuzzerMerge.cpp
index 24bd11958e80..8c8806e8aafd 100644
--- a/contrib/llvm-project/compiler-rt/lib/fuzzer/FuzzerMerge.cpp
+++ b/contrib/llvm-project/compiler-rt/lib/fuzzer/FuzzerMerge.cpp
@@ -77,6 +77,7 @@ bool Merger::Parse(std::istream &IS, bool ParseCoverage) {
   size_t ExpectedStartMarker = 0;
   const size_t kInvalidStartMarker = -1;
   size_t LastSeenStartMarker = kInvalidStartMarker;
+  bool HaveFtMarker = true;
   std::vector<uint32_t> TmpFeatures;
   std::set<uint32_t> PCs;
   while (std::getline(IS, Line, '\n')) {
@@ -93,12 +94,13 @@ bool Merger::Parse(std::istream &IS, bool ParseCoverage) {
       LastSeenStartMarker = ExpectedStartMarker;
       assert(ExpectedStartMarker < Files.size());
       ExpectedStartMarker++;
+      HaveFtMarker = false;
     } else if (Marker == "FT") {
       // FT FILE_ID COV1 COV2 COV3 ...
       size_t CurrentFileIdx = N;
       if (CurrentFileIdx != LastSeenStartMarker)
         return false;
-      LastSeenStartMarker = kInvalidStartMarker;
+      HaveFtMarker = true;
       if (ParseCoverage) {
         TmpFeatures.clear();  // use a vector from outer scope to avoid resizes.
         while (ISS1 >> N)
@@ -108,6 +110,8 @@ bool Merger::Parse(std::istream &IS, bool ParseCoverage) {
       }
     } else if (Marker == "COV") {
       size_t CurrentFileIdx = N;
+      if (CurrentFileIdx != LastSeenStartMarker)
+        return false;
       if (ParseCoverage)
         while (ISS1 >> N)
           if (PCs.insert(N).second)
@@ -116,7 +120,7 @@ bool Merger::Parse(std::istream &IS, bool ParseCoverage) {
       return false;
     }
   }
-  if (LastSeenStartMarker != kInvalidStartMarker)
+  if (!HaveFtMarker && LastSeenStartMarker != kInvalidStartMarker)
     LastFailure = Files[LastSeenStartMarker].Name;
 
   FirstNotProcessedFile = ExpectedStartMarker;