cv::flip keeps throwing bad ptr exceptions [closed]

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No matter which flip code I call with cv::flip, I keep getting bad ptr exceptions. For flipcode <1, it errors out at flipVert (copy.cpp, l.418) on src1. const uchar* src1 is defined at l.405 with a simple equation, not sure why that should be an issue. For flipcode==1, the error is in flipHoriz (copy.cpp, l.395).

I am calling cv::flip(imgcv,imgcv2,flipcode) after I convert a QImage into a Mat using:

Mat imgcv = QImage2Mat(img);
Mat imgcv2;
cv::flip(imgcv,imgcv2,flipcode);

/*static*/ Mat DisplayVideoQt::QImage2Mat(QImage const& src)
{
    QImage temp = src.copy();
    Mat res(temp.height(),temp.width(),CV_8UC3,(uchar*)temp.bits(),temp.bytesPerLine());
    cvtColor(res,res, CV_BGR2RGB);
    return res;
}