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beidson@apple.com authored
https://bugs.webkit.org/show_bug.cgi?id=125110 Reviewed by Darin Adler. It’s possible to have a null m_originatingProgressFrame when the heartbeat timer fires. On the surface this seems impossible because the only time m_originatingProgressFrame is cleared out the heartbeat timer is also stopped. But there’s likely still a race condition in multi-threaded environments. There’s no harm in null-checking m_originatingProgressFrame before accessing its loader. * loader/ProgressTracker.cpp: (WebCore::ProgressTracker::progressHeartbeatTimerFired): git-svn-id: http://svn.webkit.org/repository/webkit/trunk@159974 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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