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appsink callback race condition

Submitted by Jake Foytik

Link to original bug (#769394)

Description

In gstappsink.c, it is possible to get undefined behavior if the gst_app_sink_set_callbacks() function is called while the element is in the PLAYING state and actively using the already set callbacks.

For example, it is possible for the gst_app_sink_set_callbacks() function to set callbacks.new_sample = NULL just after the gst_app_sink_render() function checks if callback.new_sample == NULL.

This can be prevented by adding a mutex around the usage of the callbacks and around the gst_app_sink_set_callbacks() function. Another option is to not allow the callbacks to be set if the element is in the PLAYING state.

Version: 1.8.0