Fix a potential bug of ocl::CannyBuf.

The program would crash if release is called twice.

Fix a potential bug of ocl::CannyBuf.
The program would crash if release is called twice.
4f328d83 · peng xiao · 75861452 · 4f328d83
Commit 4f328d83 authored Apr 12, 2013 by peng xiao
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canny.cpp modules/ocl/src/canny.cpp +5 -1

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--- a/modules/ocl/src/canny.cpp
+++ b/modules/ocl/src/canny.cpp
@@ -112,7 +112,11 @@ void cv::ocl::CannyBuf::release()
    mapBuf.release();
    trackBuf1.release();
    trackBuf2.release();
-    openCLFree(counter);
+    if(counter)
+    {
+        openCLFree(counter);
+        counter = NULL;
+    }
 }
 namespace cv