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configmanager: set a limit to config variable substitutions
fixes #4198
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1 changed files with 10 additions and 0 deletions
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@ -1478,7 +1478,10 @@ std::string CConfigManager::parseKeyword(const std::string& COMMAND, const std::
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void CConfigManager::applyUserDefinedVars(std::string& line, const size_t equalsPlace) {
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auto dollarPlace = line.find_first_of('$', equalsPlace);
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int times = 0;
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while (dollarPlace != std::string::npos) {
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times++;
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const auto STRAFTERDOLLAR = line.substr(dollarPlace + 1);
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bool found = false;
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@ -1501,6 +1504,13 @@ void CConfigManager::applyUserDefinedVars(std::string& line, const size_t equals
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}
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dollarPlace = line.find_first_of('$', dollarPlace + 1);
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if (times > 256 /* arbitrary limit */) {
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line = "";
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parseError = "Maximum variable recursion limit hit. Evaluating the line led to too many variable substitutions.";
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Debug::log(ERR, "Variable recursion limit hit in configmanager");
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break;
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}
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}
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}
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