Float overflows when cast to int in get_subbox_chart_physical()

[y-guyon]

System information (version)

• OpenCV => 4.6
• Operating System / Platform => Linux 64 Bit
• Compiler => gcc

Detailed description

h may overflow the cast to int in get_subbox_chart_physical():

opencv_contrib/modules/mcc/src/checker_detector.cpp

Line 1121 in 8eaa8ac

size = cv::Size((int)w, (int)h);

It may not SIGILL for you but you can add if (h > INT_MAX) abort(); to detect the issue.

Steps to reproduce

At head (cde1864 / 8eaa8ac) with input https://en.wikipedia.org/wiki/File:Gretag-Macbeth_ColorChecker.jpg:

#include "opencv2/imgcodecs.hpp"
#include "opencv2/mcc.hpp"

int main(int, char**) {
  cv::Mat mat = cv::imread("Gretag-Macbeth_ColorChecker.jpg");
  cv::Ptr<cv::mcc::CCheckerDetector> detector = cv::mcc::CCheckerDetector::create();
  cv::Ptr<cv::mcc::DetectorParameters> params = cv::mcc::DetectorParameters::create();
  params->adaptiveThreshWinSizeMin = 11;
  params->adaptiveThreshWinSizeStep = 4;
  detector->process(mat, cv::mcc::TYPECHART::MCC24, /*nc=*/1, /*use_net=*/false, params);
  return 0;
}

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc