If QFile is empty, readAll() crashes with std::bad_alloc

#include <QApplication>
#include <QtCore/QFile>
#include <QtCore/QDebug>

int main(int argc, char *argv[])
{
    for(;;)
    {
        int size = rand()%128;
        qDebug()<<size;

        char* data = (char*)malloc(size);


        for(int i=0;i<size;i++)
            data[i] = 'j';
        free(data);

        QFile f;
        qDebug()<<"read list "<<QString::number((int)f.size());

        f.readAll();
    }

    return 0;
}