[Bug 777955] New: asfdemux: out of bounds read in gst_asf_demux_process_ext_content_desc

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777955

            Bug ID: 777955
           Summary: asfdemux: out of bounds read in
                    gst_asf_demux_process_ext_content_desc
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-ugly
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: hanno at hboeck.de
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 344585
  --> https://bugzilla.gnome.org/attachment.cgi?id=344585&action=edit
poc file

The attached file causes an out of bounds heap read.

asan error:
==21528==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x602000036f50 at pc 0x7fc0f14f51ad bp 0x7fc0f0b3efb0 sp 0x7fc0f0b3efa8
READ of size 4 at 0x602000036f50 thread T2 (asfdemux0:sink)
    #0 0x7fc0f14f51ac in __gst_fast_read32
/usr/include/gstreamer-1.0/gst/gstutils.h:122:10
    #1 0x7fc0f14f51ac in gst_asf_demux_process_ext_content_desc
/f/gstreamer/gst-plugins-ugly/gst/asfdemux/gstasfdemux.c:3442
    #2 0x7fc0f14f51ac in gst_asf_demux_process_object
/f/gstreamer/gst-plugins-ugly/gst/asfdemux/gstasfdemux.c:4437
    #3 0x7fc0f14f0225 in gst_asf_demux_process_header
/f/gstreamer/gst-plugins-ugly/gst/asfdemux/gstasfdemux.c:3638:11
    #4 0x7fc0f14f0225 in gst_asf_demux_process_object
/f/gstreamer/gst-plugins-ugly/gst/asfdemux/gstasfdemux.c:4422
    #5 0x7fc0f14dd682 in gst_asf_demux_pull_headers
/f/gstreamer/gst-plugins-ugly/gst/asfdemux/gstasfdemux.c:1229:10
    #6 0x7fc0f14dd682 in gst_asf_demux_loop
/f/gstreamer/gst-plugins-ugly/gst/asfdemux/gstasfdemux.c:1984
    #7 0x7fc0fe747983 in gst_task_func
/f/gstreamer/gstreamer/gst/gsttask.c:335:5
    #8 0x7fc0fd944b2d in g_thread_pool_thread_proxy
/var/tmp/portage/dev-libs/glib-2.50.2/work/glib-2.50.2/glib/gthreadpool.c:307
    #9 0x7fc0fd944154 in g_thread_proxy
/var/tmp/portage/dev-libs/glib-2.50.2/work/glib-2.50.2/glib/gthread.c:784
    #10 0x7fc0fd3c2453 in start_thread (/lib64/libpthread.so.0+0x7453)
    #11 0x7fc0fcef25dc in clone (/lib64/libc.so.6+0xe75dc)

0x602000036f51 is located 0 bytes to the right of 1-byte region
[0x602000036f50,0x602000036f51)
allocated by thread T2 (asfdemux0:sink) here:
    #0 0x4cbbb8 in malloc (/usr/bin/gst-discoverer-1.0+0x4cbbb8)
    #1 0x7fc0fd922768 in g_malloc
/var/tmp/portage/dev-libs/glib-2.50.2/work/glib-2.50.2/glib/gmem.c:94

Thread T2 (asfdemux0:sink) created by T1 (typefind:sink) here:
    #0 0x42df2d in __interceptor_pthread_create
(/usr/bin/gst-discoverer-1.0+0x42df2d)
    #1 0x7fc0fd9611bf in g_system_thread_new
/var/tmp/portage/dev-libs/glib-2.50.2/work/glib-2.50.2/glib/gthread-posix.c:1170

Thread T1 (typefind:sink) created by T0 here:
    #0 0x42df2d in __interceptor_pthread_create
(/usr/bin/gst-discoverer-1.0+0x42df2d)
    #1 0x7fc0fd9611bf in g_system_thread_new
/var/tmp/portage/dev-libs/glib-2.50.2/work/glib-2.50.2/glib/gthread-posix.c:1170

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