[tracker] tracker-extract: jpeg: Bugfix for NB#169105, critical when IPTC data isn't available

[Philip Van Hoof <pvanhoof src gnome org>]

commit 3e1da05b40c82fdca4eab70abaf33a6f987540d6
Author: Philip Van Hoof <philip codeminded be>
Date:   Mon May 17 16:04:56 2010 +0200

    tracker-extract: jpeg: Bugfix for NB#169105, critical when IPTC data isn't available

 src/tracker-extract/tracker-extract-jpeg.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-jpeg.c b/src/tracker-extract/tracker-extract-jpeg.c
index 0c530f3..3e07c9d 100644
--- a/src/tracker-extract/tracker-extract-jpeg.c
+++ b/src/tracker-extract/tracker-extract-jpeg.c
@@ -238,9 +238,9 @@ extract_jpeg (const gchar          *uri,
 			str = (gchar*) marker->data;
 			len = marker->data_length;
 #ifdef HAVE_LIBIPTCDATA
-			if (strncmp (PS3_NAMESPACE, str, PS3_NAMESPACE_LENGTH) == 0) {
+			if (len > 0 && strncmp (PS3_NAMESPACE, str, PS3_NAMESPACE_LENGTH) == 0) {
 				offset = iptc_jpeg_ps3_find_iptc (str, len, &sublen);
-				if (offset > 0) {
+				if (offset > 0 && sublen > 0) {
 					id = tracker_iptc_new (str + offset, sublen, uri);
 				}
 			}