Qt application crash when trying to delete Qimage Format_RGB888 - qt

Question

I get a "HEAP CORRUPTION DETECTED: After normal block ... CRT detected that the application wrote to memory after end of heap buffer." when variable test gets destroyed.
If I change the image size, the crash does not occur, I'm thinking it has something to do with memory alignment, but I cannot figure out what.
I am using the official Qt builds for MSVC 2017 64bit
#include <QCoreApplication>
#include <QImage>
QImage foo(int width, int height)
{
QImage retVal(width, height, QImage::Format_RGB888);
for (int i = 0; i < height; ++i) // read each line of the image
{
QRgb *lineBuf = reinterpret_cast<QRgb *>(retVal.scanLine(i));
for (int j = 0; j < width; ++j)
{
lineBuf[j] = qRgb(0,0,0);
}
}
return retVal;
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
{
QImage test = foo(5,5);
}
return a.exec();
}

Answer 1

As GM suggested in the comment above, the problem is that QRgb is a 32bit construct.
I've changed the code replacing QRgb with a custom RGB struct
struct RGB {
uint8_t r;
uint8_t g;
uint8_t b;
};
QImage foo(int width, int height)
{
QImage retVal(width, height, QImage::Format_RGB888);
for (int i = 0; i < height; ++i) // read each line of the image
{
RGB *lineBuf = reinterpret_cast<RGB *>(retVal.scanLine(i));
for (int j = 0; j < width; ++j)
{
RGB tmp;
//.... do stuff with tmp
lineBuf[j] = tmp;
}
}
return retVal;
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
{
QImage test = foo(5,5);
}
return a.exec();
}