[C++] Segmentation fault when call ParseFromString with bad data

[wcb33]

What version of protobuf and what language are you using? Version: v3.12, install by apt in Debian 12 Language: C++

What operating system (Linux, Windows, ...) and version? Debian 12

What runtime / compiler are you using (e.g., python version or gcc version) clang

What did you do? Run this code

int main(int argc, char** args)
{
    string v1("1");
    TestPackage p;
    //if (p.ParsePartialFromString(v1))
    if (p.ParseFromString(v1))
    {
        cout << "succeed" << endl;
    }
    else
    {
        cout << "error" << endl;
    }
    cout << "quit" << endl;
}

What did you expect to see print "error"

What did you see instead? Segmentation fault

Anything else we should know about your project / environment The proto

syntax = "proto3";

option cc_enable_arenas = false;

package Base;
message TestPackage
{
    int32 Function = 1;
    fixed64 ID = 2;
}

[zhangskz]

Do you still hit this in a recent, supported version of protobuf e.g. 4.25.x, 5.27.x? Protobuf v3.12 is very old and out of support. https://protobuf.dev/support/version-support/#cpp

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