[Bug 777263] New: heap out of bounds read in gst_date_time_new_from_iso8601_string

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777263

            Bug ID: 777263
           Summary: heap out of bounds read in
                    gst_date_time_new_from_iso8601_string
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: hanno at hboeck.de
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 343489
  --> https://bugzilla.gnome.org/attachment.cgi?id=343489&action=edit
oob heap poc

When compiled with asan the attached file will trigger an out of bounds heap
read.

ASAN error:
==17371==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x60300004dcf6 at pc 0x7ffb7e6935fb bp 0x7ffb7124b150 sp 0x7ffb7124b148
READ of size 1 at 0x60300004dcf6 thread T2 (avidemux0:sink)
    #0 0x7ffb7e6935fa in gst_date_time_new_from_iso8601_string
/f/gstreamer/gstreamer/gst/gstdatetime.c:870:11
    #1 0x7ffb7e85dd85 in gst_value_deserialize_date_time
/f/gstreamer/gstreamer/gst/gstvalue.c:6224:14
    #2 0x7ffb7e84d555 in gst_value_deserialize
/f/gstreamer/gstreamer/gst/gstvalue.c:5607:12
    #3 0x7ffb7127168f in parse_tag_value
/f/gstreamer/gst-plugins-base/gst-libs/gst/riff/riff-read.c:642:11
    #4 0x7ffb7127168f in gst_riff_parse_info
/f/gstreamer/gst-plugins-base/gst-libs/gst/riff/riff-read.c:802
    #5 0x7ffb714ee5f9 in gst_avi_demux_stream_header_pull
/f/gstreamer/gst-plugins-good/gst/avi/gstavidemux.c:4209:13
    #6 0x7ffb714e6786 in gst_avi_demux_loop
/f/gstreamer/gst-plugins-good/gst/avi/gstavidemux.c:5687:13
    #7 0x7ffb7e7f78b3 in gst_task_func
/f/gstreamer/gstreamer/gst/gsttask.c:334:5
    #8 0x7ffb7d9f4b2d 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 0x7ffb7d9f4154 in g_thread_proxy
/var/tmp/portage/dev-libs/glib-2.50.2/work/glib-2.50.2/glib/gthread.c:784
    #10 0x7ffb7d472453 in start_thread (/lib64/libpthread.so.0+0x7453)
    #11 0x7ffb7cfa25dc in clone (/lib64/libc.so.6+0xe75dc)

0x60300004dcf6 is located 0 bytes to the right of 22-byte region
[0x60300004dce0,0x60300004dcf6)
allocated by thread T2 (avidemux0:sink) here:
    #0 0x4cbbb8 in malloc (/usr/bin/gst-discoverer-1.0+0x4cbbb8)
    #1 0x7ffb7d9d2768 in g_malloc
/var/tmp/portage/dev-libs/glib-2.50.2/work/glib-2.50.2/glib/gmem.c:94

Thread T2 (avidemux0:sink) created by T1 (typefind:sink) here:
    #0 0x42df2d in __interceptor_pthread_create
(/usr/bin/gst-discoverer-1.0+0x42df2d)
    #1 0x7ffb7da111bf 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 0x7ffb7da111bf 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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