Memory leak in SkCanvas::drawText

Question

I am using Skia for rendering. I am getting memory leak in following code on Mac OS X. Xcode Instrument shows a memory leak here.

//mytext is text in UTF-16 encoding.
//skpaint is a SkPaint *
//canvas is SkCanvas * which is initialized.
canvas->drawText(mytext, mytextlen*sizeof(char16_t), 0, 0, *skpaint);

On Windows, it is not showing any memory leak, but on Mac OS X.

I would like to know why is it giving memory leak. Is it something else which is causing this memory leak.