[Bug 708849] hlsdemux occasionally dereferencing NULL in gst_hls_demux_switch_playlist

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=708849
  GStreamer | gst-plugins-bad | 1.2.0

--- Comment #1 from A Ashley <bugzilla at ashley-family.net> 2013-09-26 16:01:13 UTC ---
Created an attachment (id=255850)
 View: https://bugzilla.gnome.org/attachment.cgi?id=255850
 Review: https://bugzilla.gnome.org/review?bug=708849&attachment=255850

Fix for NULL dereference

This patch does two things:
* move the g_queue_peek_tail inside the semaphore protection
* check if q_queue_peek_tail returns NULL

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