QTiffHandler::option() leaks memory

#include <QCoreApplication>
#include <QImageReader>
#include <QRgb>

int main (int argc, char ** argv)
{
QImage image(QSize(2, 2), QImage::Format_RGB32);
image.fill(qRgb(255, 255, 255));
image.save("/tmp/test.tif");

QImageReader reader("/tmp/test.tif");
reader.size();
}

==22750== 2,340 (996 direct, 1,344 indirect) bytes in 1 blocks are definitely lost in loss record 33 of 35
==22750==    at 0x4C284A8: malloc (vg_replace_malloc.c:236)
==22750==    by 0x8C7F8E2: TIFFClientOpen (tif_open.c:161)
==22750==    by 0x8C5ECDA: QTiffHandler::option(QImageIOHandler::ImageOption) const (qtiffhandler.cpp:603)
==22750==    by 0x5100AD4: QImageReader::size() const (qimagereader.cpp:931)