[Bug 675270] New: Potential memory leak in 0.10.36

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=675270
  GStreamer | common | 0.10.36

           Summary: Potential memory leak in 0.10.36
    Classification: Platform
           Product: GStreamer
           Version: 0.10.36
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: common
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: g.stark at realdigitalmedia.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=213253)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=213253)
Patch to show unbalanced malloc/free

An application I was running was memory stable under 0.10.35 but after
upgrading to Ubuntu 12.04 and gstreamer 0.10.36 the app shows a linear growth
in memory.

valgrind results look similar to #674787 but I'm not sure if this is the same
issue.

I added some debug code to gstvideoscale.c since it showed the largest memory
leak.

When run with playbin2 I see multiple passes to a malloc statement without an
unmatched free. However, running with playbin I do see matched malloc/free.

See: https://gist.github.com/2571816

gst-launch playbin2 uri=......
0:00:00.676655349  2908  0x938e120 DEBUG             videoscale
gstvideoscale.c:310:gst_video_scale_init: GES: calling video scale init
0:00:00.838913586  2908 0xb5e05120 DEBUG             videoscale
gstvideoscale.c:533:gst_video_scale_set_caps: GES: calling video scale malloc
0:00:00.841475643  2908 0xb5e05120 DEBUG             videoscale
gstvideoscale.c:530:gst_video_scale_set_caps: GES: calling video scale free
before malloc
0:00:00.841486201  2908 0xb5e05120 DEBUG             videoscale
gstvideoscale.c:533:gst_video_scale_set_caps: GES: calling video scale malloc

gst-launch playbin uri=......
0:00:01.136025328  2485  0x8dbeef0 DEBUG             videoscale
gstvideoscale.c:310:gst_video_scale_init: GES: calling video scale init
0:00:01.444486894  2485 0xb609fc60 DEBUG             videoscale
gstvideoscale.c:533:gst_video_scale_set_caps: GES: calling video scale malloc
0:00:03.937730093  2485  0x8db9600 DEBUG             videoscale
gstvideoscale.c:324:gst_video_scale_finalize: GES: calling video scale finalize
0:00:03.937742026  2485  0x8db9600 DEBUG             videoscale
gstvideoscale.c:327:gst_video_scale_finalize: GES: calling video scale free

I don't think the memory leak is in gstvideoscale but in something higher up
the chain.

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