[Bug] linemod::match crashes with SIGSEGV due to misaligned store in orUnaligned8u #29559

System Information

• OpenCV version: 5.0.0 (contrib)
• Operating System: Arch Linux
• Compiler: GCC 14
• CPU: Intel Core i7-9750H(SSE2 / SSE3 supported)

Detailed description

When calling cv::linemod::Detector::match(), the process crashes with a segmentation fault deep inside the SIMD-optimized helper function orUnaligned8u. The crash occurs because the function uses an aligned store instruction (_mm_or_si128 with dereferenced __m128i*) on a destination pointer that is not guaranteed to be 16-byte aligned.

Steps to reproduce

1. Create a linemod detector, add at least one template using a reference image and a binary mask.
2. Prepare a test image whose width (in bytes) is not a multiple of 16 (e.g., width = 218 for a 3-channel image, giving a stride of 654).
3. Call detector->match(sources, threshold, matches).

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)