[Bug 786051] New: glupload: EGLImage cache is not thread safe
GStreamer (GNOME Bugzilla)
bugzilla at gnome.org
Wed Aug 9 14:00:09 UTC 2017
https://bugzilla.gnome.org/show_bug.cgi?id=786051
Bug ID: 786051
Summary: glupload: EGLImage cache is not thread safe
Classification: Platform
Product: GStreamer
Version: 1.13.x
OS: Linux
Status: NEW
Severity: normal
Priority: Normal
Component: gst-plugins-bad
Assignee: gstreamer-bugs at lists.freedesktop.org
Reporter: nicolas at ndufresne.ca
QA Contact: gstreamer-bugs at lists.freedesktop.org
GNOME version: ---
When we receive a DMABuf, we create a cache associated EGLImage. While the
wrapper is refcounted, the way we store that EGLImage is not thread safe. The
problem is that we don't get and ref the EGLImage atomically when retrieving
the qdata. So in between, sometimes the EGLImage get destroyed, and then we
ended with use after free crashing GStreamer or Mesa.
The pipeline I use to reproduce currently:
gst-launch-1.0 v4l2src device=/dev/video1 io-mode=dmabuf ! tee name=t \
t. ! queue ! glsinkbin sink=gtkglsink \
t. ! queue ! glsinkbin sink=gtkglsink \
t. ! queue ! glsinkbin sink=gtkglsink \
t. ! queue ! glsinkbin sink=gtkglsink \
t. ! queue ! glsinkbin sink=gtkglsink
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