Segfault when Calling: Callback -> C-Function -> Callback

[nwrkbiz]

Reproduced on Windows (64 Bit) and Linux (64 Bit Debian).

.DLL/.SO:

// fail.cpp
extern "C" {

typedef void (*cb)(char);

void callMe(cb clbk){
  clbk('a');
  clbk('b'); // this will fail
}

char getC(){
  return 'c';
}

}

// built using:
// g++ -g -c -o fail.o ./fail.cpp
// g++ -shared -o fail.so fail.o

.js

// fail.js
const koffi = require('./build/koffi.node');
const lib = koffi.load('./fail.so');

const cb = koffi.callback('void cb(char)');
const getC = lib.func('char getC()');
const callMe = lib.func('void callMe(cb* clbk)');

const rawCB = koffi.register(function(result){
        console.log(getC()); // this call somehow messes up the second trampoline call, a wrong CallData object (the object of getC) is then used for clbk('b')
        console.log(result);
    }, koffi.pointer(cb));


callMe(rawCB);
// node ./fail.js
// prints:
// 99 (c)
// 97 (a)
// Segementation fault

It seems like this pointer here points to the already deleted CallData object created by the getC call, but should point to the CallData Object of the initial callMe call:

[Koromix]

Thanks for the report, I've pushed a fix and I will release 2.2.1 today :)

[Koromix]

Released :)

[nwrkbiz]

Thank you for the fast fix, I will test with my lib.

[nwrkbiz]

Works like a charm!