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asfdemux: Add sanity checks when reading asf_stream_video_format

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It should report a size of at least 40 bytes
Also check for the size of the remaining data (i.e. codec_data)

https://bugzilla.gnome.org/show_bug.cgi?id=775070
This commit is contained in:
Edward Hervey 2016-11-25 09:45:04 +01:00 committed by Edward Hervey
parent 97294eb8bb
commit 8f05e8f449
1 changed files with 13 additions and 2 deletions
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15
gst/asfdemux/gstasfdemux.c
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@ -2532,6 +2532,15 @@ gst_asf_demux_get_stream_video_format (asf_stream_video_format * fmt,
return FALSE;
fmt->size = gst_asf_demux_get_uint32 (p_data, p_size);
/* Sanity checks */
if (fmt->size < 40) {
GST_WARNING ("Corrupted asf_stream_video_format (size < 40)");
return FALSE;
}
if ((guint64) fmt->size - 4 > *p_size) {
GST_WARNING ("Corrupted asf_stream_video_format (codec_data is too small)");
return FALSE;
}
fmt->width = gst_asf_demux_get_uint32 (p_data, p_size);
fmt->height = gst_asf_demux_get_uint32 (p_data, p_size);
fmt->planes = gst_asf_demux_get_uint16 (p_data, p_size);
@ -2725,7 +2734,7 @@ gst_asf_demux_add_video_stream (GstASFDemux * demux,
gchar *str;
gchar *name = NULL;
gchar *codec_name = NULL;
gint size_left = video->size - 40;
guint64 size_left = video->size - 40;
GstBuffer *streamheader = NULL;
guint par_w = 1, par_h = 1;
@ -2736,7 +2745,9 @@ gst_asf_demux_add_video_stream (GstASFDemux * demux,
/* Now try some gstreamer formatted MIME types (from gst_avi_demux_strf_vids) */
if (size_left) {
GST_LOG ("Video header has %d bytes of codec specific data", size_left);
GST_LOG ("Video header has %" G_GUINT64_FORMAT
" bytes of codec specific data (vs %" G_GUINT64_FORMAT ")", size_left,
*p_size);
g_assert (size_left <= *p_size);
gst_asf_demux_get_buffer (&extradata, size_left, p_data, p_size);
}