LLVM reports memory leak in boost::gil::read_image

[nathanowen42]

Actual behavior

llvm reports a 1 byte memory leak in boost::gil::read_image when provided with a valid jpeg image. This was produced when using a boost::gil::any_image<boost::gil::gray8_image_t, boost::gil::gray16_image_t, boost::gil::rgb8_image_t, boost::gil::rgb16_image_t>

Expected behavior

There should not be a memory leak in this case.

C++ Minimal Working Example

#include <iostream>
#include <vector>
#include <sstream>

#include <boost/gil.hpp>
#include <boost/gil/extension/dynamic_image/any_image.hpp>
#include <boost/gil/extension/io/jpeg.hpp>

std::vector<uint8_t> load_jpeg(const std::string& filepath)
{
    std::vector<uint8_t> data;

    try
    {
        boost::gil::any_image<boost::gil::gray8_image_t, boost::gil::gray16_image_t, boost::gil::rgb8_image_t,
            boost::gil::rgb16_image_t> image;
        boost::gil::read_image(filepath, image, boost::gil::jpeg_tag());
        std::ostringstream out;
        boost::gil::write_view(out, boost::gil::view(image), boost::gil::jpeg_tag());
        auto output = out.str();
        data.resize(output.size());
        std::copy(std::begin(output), std::end(output), data.data());
    }
    catch (std::ios_base::failure& err)
    {
        std::cerr << "failed to get jpeg data for " << filepath << ": " << err.what() << std::endl;
        return {};
    }

    return data;
}

int main()
{
    auto data = load_jpeg("./sample.jpeg");
    std::cout << "loaded " << data.size() << " bytes";
}

Environment

• Compiler version: gcc version 10.2.1 20201125 (Red Hat 10.2.1-9) (GCC) clang version 10.0.1 (Fedora 10.0.1-3.fc32)

• Build settings:

Docker build/test environment:

#!/bin/bash
DOCKER_TAG=boost_test
docker build -t "${DOCKER_TAG}" - <<EOT
FROM fedora:32
RUN sudo dnf install -y wget gcc-c++ clang libjpeg-turbo-devel
RUN sudo dnf clean all
RUN groupadd -g 1000 build && useradd -u 1000 -g 1000 -ms /bin/bash build && usermod -a -G wheel build && usermod -a -G users build
WORKDIR /tmp/build
RUN wget 'https://dl.bintray.com/boostorg/release/1.75.0/source/boost_1_75_0.tar.gz'
RUN tar xfvz boost_1_75_0.tar.gz
WORKDIR /tmp/build/boost_1_75_0
RUN ./bootstrap.sh --with-libraries=all --with-toolset=gcc --prefix=/usr/lib/boost_1_75_0
RUN ./b2 debug install
EOT

if [ $? == 0 ] ; then
    docker run --rm -it -v `pwd`:`pwd` -w `pwd` --rm --name build-env --user=build "${DOCKER_TAG}"
fi

Build script:

#!/bin/bash
export LIBRARY_PATH=$LIBRARY_PATH:/usr/lib/boost_1_75_0
clang++ -O1 -g -I/usr/lib/boost_1_75_0/include -fsanitize=address -fno-omit-frame-pointer -c test_gil.cpp
clang++ -g -L/usr/lib/boost_1_75_0/lib -ljpeg -fsanitize=address test_gil.o -o test_gil
ASAN_OPTIONS=detect_leaks=1 ./test_gil

• Version (<boost/version.hpp>): 107500