We read past the end of the initialized part of the buffer, seemingly on purpose (no one knows the details of this code anymore). The right thing to do is probably to zero that part of the buffer. (The *right* right thing to would be to rewrite this so that it was easier to see what data was supposed to be where when, but priorities...) BUG=chromium:683040 Review-Url: https://codereview.webrtc.org/2659383002 Cr-Commit-Position: refs/heads/master@{#16365}