From 2ceda58d80861c0d4110efb69f9559bbf140bce0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=86=8A=E9=98=94=E8=B1=AA?= <2245258671@qq.com>
Date: Tue, 19 May 2026 18:41:08 +0800
Subject: [PATCH] Merge pull request #29040 from MrBear999-ui:project4_MrBear

imgproc: add kernel size validation in boxFilter #29040

Check that ksize dimensions are strictly positive in boxFilter(), returning StsBadSize error instead of producing undefined behavior.

Pull Request Readiness Checklist
See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake
---
 modules/imgproc/src/box_filter.dispatch.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/imgproc/src/box_filter.dispatch.cpp b/modules/imgproc/src/box_filter.dispatch.cpp
index 347cdc421e..1d23c72859 100644
--- a/modules/imgproc/src/box_filter.dispatch.cpp
+++ b/modules/imgproc/src/box_filter.dispatch.cpp
@@ -369,6 +369,7 @@ void boxFilter(InputArray _src, OutputArray _dst, int ddepth,
     CV_INSTRUMENT_REGION();
 
     CV_Assert(!_src.empty());
+    CV_Assert(ksize.width > 0 && ksize.height > 0);
 
     CV_OCL_RUN(_dst.isUMat() &&
                (borderType == BORDER_REPLICATE || borderType == BORDER_CONSTANT ||