Fix undefined behaviour reported by the new --enable-expensive-checks option.
llvm-svn: 37829
diff --git a/llvm/lib/Support/MemoryBuffer.cpp b/llvm/lib/Support/MemoryBuffer.cpp
index 0e85702..43eb181 100644
--- a/llvm/lib/Support/MemoryBuffer.cpp
+++ b/llvm/lib/Support/MemoryBuffer.cpp
@@ -251,8 +251,9 @@
while (size_t ReadBytes = fread(Buffer, 1, 4096*4, stdin))
FileData.insert(FileData.end(), Buffer, Buffer+ReadBytes);
+ FileData.push_back(0); // &FileData[Size] is invalid. So is &*FileData.end().
size_t Size = FileData.size();
MemoryBuffer *B = new STDINBufferFile();
- B->initCopyOf(&FileData[0], &FileData[Size]);
+ B->initCopyOf(&FileData[0], &FileData[Size-1]);
return B;
}