Memory leak in RGB2Lab

edit

There is a memory leak when using RBG2Lab. Is this an issue with OpenCV? The version is 3.4.11.

// lab.cpp
#include <opencv2/imgproc/imgproc.hpp>

int main()
{
  cv::Mat in = cv::Mat::zeros(1, 1, CV_8UC3);
  cv::Mat lab;
  cv::cvtColor(in, lab, CV_RGB2Lab);
}

Compile: g++ `pkg-config --libs --cflags opencv` lab.cpp

Run: valgrind --leak-check=full a.out

Output:

==2689== Memcheck, a memory error detector
==2689== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==2689== Using Valgrind-3.12.0 and LibVEX; rerun with -h for copyright info
==2689== Command: lab
==2689== 
==2689== 
==2689== HEAP SUMMARY:
==2689==     in use at exit: 4,716,918 bytes in 321 blocks
==2689==   total heap usage: 5,506 allocs, 5,185 frees, 5,396,766 bytes allocated
==2689== 
==2689== 16,456 bytes in 1 blocks are possibly lost in loss record 101 of 109
==2689==    at 0x4A08178: malloc (vg_replace_malloc.c:298)
==2689==    by 0x93164D0: cv::fastMalloc(unsigned long) (alloc.cpp:150)
==2689==    by 0x76678CE: allocSingleton<float> (private.hpp:153)
==2689==    by 0x76678CE: splineBuild(cv::softfloat const*, unsigned long) [clone .constprop.37] (color_lab.cpp:22)
==2689==    by 0x7669300: cv::initLabTabs() (color_lab.cpp:1221)
==2689==    by 0x7679DD4: RGB2Lab_b (color_lab.cpp:1547)
==2689==    by 0x7679DD4: cv::hal::cvtBGRtoLab(unsigned char const*, unsigned long, unsigned char*, unsigned long, int, int, int, int, bool, bool, bool) (color_lab.cpp:4176)
==2689==    by 0x767F4AC: cv::cvtColorBGR2Lab(cv::_InputArray const&, cv::_OutputArray const&, bool, bool) (color_lab.cpp:4668)
==2689==    by 0x76DDE71: cv::cvtColor(cv::_InputArray const&, cv::_OutputArray const&, int, int) (color.cpp:270)
==2689==    by 0x400B5C: main (in a.out)
==2689== 
==2689== 16,456 bytes in 1 blocks are possibly lost in loss record 102 of 109
==2689==    at 0x4A08178: malloc (vg_replace_malloc.c:298)
==2689==    by 0x93164D0: cv::fastMalloc(unsigned long) (alloc.cpp:150)
==2689==    by 0x76678CE: allocSingleton<float> (private.hpp:153)
==2689==    by 0x76678CE: splineBuild(cv::softfloat const*, unsigned long) [clone .constprop.37] (color_lab.cpp:22)
==2689==    by 0x76695D4: cv::initLabTabs() (color_lab.cpp:1231)
==2689==    by 0x7679DD4: RGB2Lab_b (color_lab.cpp:1547)
==2689==    by 0x7679DD4: cv::hal::cvtBGRtoLab(unsigned char const*, unsigned long, unsigned char*, unsigned long, int, int, int, int, bool, bool, bool) (color_lab.cpp:4176)
==2689==    by 0x767F4AC: cv::cvtColorBGR2Lab(cv::_InputArray const&, cv::_OutputArray const&, bool, bool) (color_lab.cpp:4668)
==2689==    by 0x76DDE71: cv::cvtColor(cv::_InputArray const&, cv::_OutputArray const&, int, int) (color.cpp:270)
==2689==    by 0x400B5C: main (in a.out)
==2689== 
==2689== 16,456 bytes in 1 blocks are possibly lost in loss record 103 of 109
==2689==    at 0x4A08178: malloc (vg_replace_malloc.c:298)
==2689==    by 0x93164D0: cv::fastMalloc(unsigned long) (alloc.cpp:150)
==2689==    by 0x76678CE: allocSingleton<float> (private.hpp:153)
==2689==    by 0x76678CE: splineBuild(cv::softfloat const*, unsigned long) [clone .constprop.37] (color_lab.cpp:22)
==2689==    by 0x76695E5: cv::initLabTabs() (color_lab.cpp:1232)
==2689==    by 0x7679DD4: RGB2Lab_b (color_lab.cpp:1547)
==2689==    by 0x7679DD4: cv::hal::cvtBGRtoLab(unsigned char const*, unsigned long, unsigned char*, unsigned long, int, int, int, int, bool, bool, bool) (color_lab.cpp:4176)
==2689==    by 0x767F4AC: cv::cvtColorBGR2Lab(cv ...