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-rw-r--r--clang/lib/Frontend/SerializedDiagnosticReader.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/clang/lib/Frontend/SerializedDiagnosticReader.cpp b/clang/lib/Frontend/SerializedDiagnosticReader.cpp
index 8a8161488f4..08b7087fbad 100644
--- a/clang/lib/Frontend/SerializedDiagnosticReader.cpp
+++ b/clang/lib/Frontend/SerializedDiagnosticReader.cpp
@@ -27,6 +27,9 @@ std::error_code SerializedDiagnosticReader::readDiagnostics(StringRef File) {
llvm::BitstreamCursor Stream(**Buffer);
Optional<llvm::BitstreamBlockInfo> BlockInfo;
+ if (Stream.AtEndOfStream())
+ return SDError::InvalidSignature;
+
// Sniff for the signature.
if (Stream.Read(8) != 'D' ||
Stream.Read(8) != 'I' ||
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