opencv_contrib: wechat_qrcode exception

System information (version)

• OpenCV => 4.2
• Operating System / Platform => Ubuntu16.04
• Compiler => g++

Detailed description

qrcode decode image get a Segmentation Fault received signal SIGSEGV, Segmentation fault. （double free or corruption (out)） #0 0x00005555555949db in zxing::UnicomBlock::Bfs(int, int) () #1 0x0000555555594b09 in zxing::UnicomBlock::GetUnicomBlockIndex(int, int) () #2 0x00005555555b684f in zxing::qrcode::FinderPatternFinder::find(zxing::DecodeHints const&, zxing::ErrorHandler&) () #3 0x00005555555a1fd3 in zxing::qrcode::Detector::detect(zxing::DecodeHints const&, zxing::ErrorHandler&) () #4 0x00005555555ba32d in zxing::qrcode::QRCodeReader::decodeMore(zxing::Refzxing::BinaryBitmap, zxing::Refzxing::BitMatrix, zxing::DecodeHints, zxing::ErrorHandler&) () #5 0x00005555555bc7a1 in zxing::qrcode::QRCodeReader::decode(zxing::Refzxing::BinaryBitmap, zxing::DecodeHints) () #6 0x00005555555797e4 in cv::wechat_qrcode::DecoderMgr::Decode(zxing::Refzxing::BinaryBitmap, zxing::DecodeHints) () #7 0x0000555555579984 in cv::wechat_qrcode::DecoderMgr::TryDecode(zxing::Refzxing::LuminanceSource, zxing::Refzxing::Result&) () #8 0x0000555555579e37 in cv::wechat_qrcode::DecoderMgr::decodeImage(cv::Mat, bool, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&) ()

Steps to reproduce

Issue submission checklist

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