gst/avi/gstavimux.c: Don't segfault on string typed tags being NULL. Fixes #560155.

Original commit message from CVS:
* gst/avi/gstavimux.c:
Don't segfault on string typed tags being NULL. Fixes #560155.

2 files changed, 6 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 7d18392b..822e77de 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-11-11  Stefan Kost  <ensonic@users.sf.net>
+
+	* gst/avi/gstavimux.c:
+	  Don't segfault on string typed tags being NULL. Fixes #560155.
+
 2008-11-10  Mark Nauwelaerts  <mark.nauwelaerts@collabora.co.uk>
 
 	* gst/matroska/matroska-mux.c: (aac_codec_data_to_codec_id),
diff --git a/gst/avi/gstavimux.c b/gst/avi/gstavimux.c
index ad41ed94..71b46d35 100644
--- a/gst/avi/gstavimux.c
+++ b/gst/avi/gstavimux.c
@@ -930,7 +930,7 @@ gst_avi_mux_write_tag (const GstTagList * list, const gchar * tag,
 
   for (n = 0; rifftags[n].fcc != 0; n++) {
     if (!strcmp (rifftags[n].tag, tag) &&
-        gst_tag_list_get_string (list, tag, &str)) {
+        gst_tag_list_get_string (list, tag, &str) && str) {
       len = strlen (str);
       plen = len + 1;
       if (plen & 1)