问QImage：：转换的SEGFAULT

EN

QImage image;
QMatrix rm;
rm.rotate(90);//I need vertical aligned picture
image.loadFromData(buf_);//buf_ is raw data QByteArray
if(image.isNull())
{
    emit error();
    return;
}
QImage trans_image = image.transformed(rm);
trans_image.save(path_, "JPG", 100);

1   qt_memrotate270_tiled_unpacked<unsigned int>                                                                                      qmemrotate.cpp           212  0x1b2ec6c  
2   qt_memrotate270_template<unsigned int>                                                                                            qmemrotate.cpp           275  0x1b2ec6c  
3   qt_memrotate270                                                                                                                   qmemrotate.cpp           315  0x1b2ec6c  
4   qt_memrotate270_32                                                                                                                qmemrotate.cpp           377  0x1b2ecd3  
5   rotated90                                                                                                                         qimage.cpp               4520 0x1a07c3f  
6   QImage::transformed                                                                                                               qimage.cpp               4627 0x1a0a502  
7   QImage::transformed                                                                                                               qimage.cpp               2792 0x1a0b1ce  
8   Camera::processImage                                                                                                              camera.cpp               293  0x438bea   
...