mirror of https://github.com/OpenTTD/OpenTTD.git
Fix: don't use non-owning string pointer in StringParameter (#11952)
The string pointer can become invalid before the reference is dropped, causing out-of-bound access in windows like ErrorWindow, or News that copy 10 or 20 parameters for their internals. Co-authored-by: Jonathan G Rennison <j.g.rennison@gmail.com>
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@ -16,7 +16,6 @@
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/** The data required to format and validate a single parameter of a string. */
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struct StringParameter {
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uint64_t data; ///< The data of the parameter.
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const char *string_view; ///< The string value, if it has any.
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std::unique_ptr<std::string> string; ///< Copied string value, if it has any.
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char32_t type; ///< The #StringControlCode to interpret this data with when it's the first parameter, otherwise '\0'.
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};
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@ -106,7 +105,7 @@ public:
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const char *GetNextParameterString()
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{
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auto ptr = GetNextParameterPointer();
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return ptr->string != nullptr ? ptr->string->c_str() : ptr->string_view;
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return ptr->string != nullptr ? ptr->string->c_str() : nullptr;
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}
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/**
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@ -152,7 +151,6 @@ public:
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assert(n < this->parameters.size());
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this->parameters[n].data = v;
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this->parameters[n].string.reset();
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this->parameters[n].string_view = nullptr;
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}
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template <typename T, std::enable_if_t<std::is_base_of<StrongTypedefBase, T>::value, int> = 0>
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@ -165,8 +163,7 @@ public:
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{
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assert(n < this->parameters.size());
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this->parameters[n].data = 0;
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this->parameters[n].string.reset();
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this->parameters[n].string_view = str;
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this->parameters[n].string = std::make_unique<std::string>(str);
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}
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void SetParam(size_t n, const std::string &str) { this->SetParam(n, str.c_str()); }
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@ -176,13 +173,12 @@ public:
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assert(n < this->parameters.size());
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this->parameters[n].data = 0;
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this->parameters[n].string = std::make_unique<std::string>(std::move(str));
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this->parameters[n].string_view = nullptr;
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}
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uint64_t GetParam(size_t n) const
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{
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assert(n < this->parameters.size());
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assert(this->parameters[n].string_view == nullptr && this->parameters[n].string == nullptr);
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assert(this->parameters[n].string == nullptr);
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return this->parameters[n].data;
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}
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@ -195,7 +191,7 @@ public:
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{
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assert(n < this->parameters.size());
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auto ¶m = this->parameters[n];
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return param.string != nullptr ? param.string->c_str() : param.string_view;
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return param.string != nullptr ? param.string->c_str() : nullptr;
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}
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};
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