[PATCH] D71172: [clang][Tooling] Fix potential UB in ExpandResponseFilesCompilationDatabase

[liu hui via Phabricator via cfe-commits]

lh123 created this revision.
lh123 added reviewers: kadircet, sammccall, hokein.
Herald added subscribers: cfe-commits, usaxena95, ilya-biryukov.
Herald added a project: clang.

`vector::assign` will cause UB at here.

fixes: https://github.com/clangd/clangd/issues/223


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D71172

Files:
  clang/lib/Tooling/ExpandResponseFilesCompilationDatabase.cpp


Index: clang/lib/Tooling/ExpandResponseFilesCompilationDatabase.cpp
===================================================================
--- clang/lib/Tooling/ExpandResponseFilesCompilationDatabase.cpp
+++ clang/lib/Tooling/ExpandResponseFilesCompilationDatabase.cpp
@@ -61,7 +61,8 @@
       llvm::StringSaver Saver(Alloc);
       llvm::cl::ExpandResponseFiles(Saver, Tokenizer, Argv, false, false, *FS,
                                     llvm::StringRef(Cmd.Directory));
-      Cmd.CommandLine.assign(Argv.begin(), Argv.end());
+      std::vector<std::string> ExpandedArgv(Argv.begin(), Argv.end());
+      Cmd.CommandLine = std::move(ExpandedArgv);
     }
     return Cmds;
   }


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