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crash JsonReader.h on Deserialize of invalid string starting with either '}' or ']'

Running either of the following code snippets will cause a crash:

 FString message = "}";
 TSharedPtr<FJsonObject> pJsonObject;
 FJsonSerializer::Deserialize(TJsonReaderFactory<>::Create(message), pJsonObject);
 
 // or
 
 FString message = "]";
 TSharedPtr<FJsonObject> pJsonObject;
 FJsonSerializer::Deserialize(TJsonReaderFactory<>::Create(message), pJsonObject);


The crash occures in JsonReader.h in the "bool NextToken( EJsonToken& OutToken )" when the ParseState object is poped on an empty object around line 410 or 418.

                 ...
                 switch (Char)
                 {
                 case CharType('{'):
                     OutToken = EJsonToken::CurlyOpen; ParseState.Push( EJson::Object );
                     return true;
 
                 case CharType('}'):
                     OutToken = EJsonToken::CurlyClose; ParseState.Pop();   // Here 
                     return true;
 
                 case CharType('['):
                     OutToken = EJsonToken::SquareOpen; ParseState.Push( EJson::Array );
                     return true;
 
                 case CharType(']'):
                     OutToken = EJsonToken::SquareClose; ParseState.Pop(); // Or Here
                     return true;
                 ...




Product Version: UE 4.12
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asked Nov 15 '16 at 09:51 PM in C++ Programming

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gehill
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