dashdemux: correctly handle an HTTP-XSDATE that is exactly the size of the date string

The code in the gst_dash_demux_parse_http_xsdate() was trying to
handle the case where the string is not null terminated by resizing
the buffer and appending a zero byte. This does not work if the buffer
is exactly the length of the string because the gst_buffer_resize()
function does not re-allocate the buffer, it just changes its size.

If a buffer is passed to gst_dash_demux_parse_http_xsdate() that is
exactly the length of the string, the function fails with an assert
failure in gst_buffer_resize().

https://bugzilla.gnome.org/show_bug.cgi?id=762148

1 files changed, 8 insertions, 6 deletions

diff --git a/ext/dash/gstdashdemux.c b/ext/dash/gstdashdemux.c
index 20d676419..cf41b0311 100644
--- a/ext/dash/gstdashdemux.c
+++ b/ext/dash/gstdashdemux.c
@@ -1846,15 +1846,17 @@ static GstDateTime *
 gst_dash_demux_parse_http_xsdate (GstDashDemuxClockDrift * clock_drift,
     GstBuffer * buffer)
 {
-  GstDateTime *value;
+  GstDateTime *value = NULL;
   GstMapInfo mapinfo;
 
   /* the string from the server might not be zero terminated */
-  gst_buffer_resize (buffer, 0, gst_buffer_get_size (buffer) + 1);
-  gst_buffer_map (buffer, &mapinfo, GST_MAP_READ | GST_MAP_WRITE);
-  mapinfo.data[mapinfo.size - 1] = '\0';
-  value = gst_date_time_new_from_iso8601_string ((const gchar *) mapinfo.data);
-  gst_buffer_unmap (buffer, &mapinfo);
+  if (gst_buffer_map (buffer, &mapinfo, GST_MAP_READ)) {
+    gchar *str;
+    str = g_strndup ((const gchar *) mapinfo.data, mapinfo.size);
+    gst_buffer_unmap (buffer, &mapinfo);
+    value = gst_date_time_new_from_iso8601_string (str);
+    g_free (str);
+  }
   return value;
 }