tracker-extract-gstreamer: Fix invalid pointer access

gst_tag_list_get_string() does not initialise the output pointer to
NULL if there is no value for that tag. In some cases, neither do we
which leads to invalid string pointers and the occasional segfault
when processing files with no tags.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/tracker-extract/tracker-extract-gstreamer.c b/src/tracker-extract/tracker-extract-gstreamer.c
index 559c5c964..250198cc0 100644
--- a/src/tracker-extract/tracker-extract-gstreamer.c
+++ b/src/tracker-extract/tracker-extract-gstreamer.c
@@ -380,7 +380,7 @@ static gchar *
 get_embedded_cue_sheet_data (GstTagList *tag_list)
 {
 	gint i, count;
-	gchar *buffer;
+	gchar *buffer = NULL;
 
 	count = gst_tag_list_get_tag_size (tag_list, GST_TAG_EXTENDED_COMMENT);
 	for (i = 0; i < count; i++) {
@@ -473,7 +473,7 @@ extractor_apply_geolocation_metadata (MetadataExtractor     *extractor,
                                       TrackerSparqlBuilder  *metadata,
                                       const gchar           *graph)
 {
-	gchar *country, *city, *sublocation;
+	gchar *country = NULL, *city = NULL, *sublocation = NULL;
 	gdouble lat, lon, alt;
 	gboolean has_coords;
 
@@ -675,7 +675,7 @@ extractor_apply_album_metadata (MetadataExtractor     *extractor,
                                 gchar                **p_album_disc_uri)
 {
 	gchar *album_artist;
-	gchar *album_title;
+	gchar *album_title = NULL;
 	gchar *album_artist_temp = NULL;
 	gchar *track_artist_temp = NULL;
 	gboolean has_it;