file_util: Check fd before using dup
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@ -1187,6 +1187,8 @@ void OpenFStream<std::ios_base::in>(
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boost_iostreams<boost::iostreams::file_descriptor_source>& fstream,
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const std::string& filename) {
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IOFile file(filename, "r");
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if (file.GetFd() == -1)
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return;
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int fd = dup(file.GetFd());
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if (fd == -1)
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return;
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@ -1199,6 +1201,8 @@ template <>
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void OpenFStream<std::ios_base::out>(
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boost_iostreams<boost::iostreams::file_descriptor_sink>& fstream, const std::string& filename) {
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IOFile file(filename, "w");
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if (file.GetFd() == -1)
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return;
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int fd = dup(file.GetFd());
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if (fd == -1)
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return;
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