[tracker/tracker-0.6] Added some extra checks for size in mp3 extraction.

[Mikael Ottela <mottela src gnome org>]

commit b6a9079cf7ada74e739dbef476df688fda49d88b
Author: Mikael Ottela <mikael ottela ixonos com>
Date:   Thu May 7 17:57:30 2009 +0300

    Added some extra checks for size in mp3 extraction.
---
 src/tracker-extract/tracker-extract-mp3.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/src/tracker-extract/tracker-extract-mp3.c b/src/tracker-extract/tracker-extract-mp3.c
index 4f15f2c..8a20bdb 100644
--- a/src/tracker-extract/tracker-extract-mp3.c
+++ b/src/tracker-extract/tracker-extract-mp3.c
@@ -303,10 +303,13 @@ read_id3v1_buffer (int fd, goffset size)
 	guint bytes_read;
 	guint rc;
 
-	if (lseek (fd, size-ID3V1_SIZE, SEEK_SET) < 0) {
+	if (size<128) {
 		return NULL;
 	}
 
+	if (lseek (fd, size-ID3V1_SIZE, SEEK_SET) < 0) {
+		return NULL;
+	}
 
 	buffer = g_malloc (ID3V1_SIZE);
 
@@ -454,6 +457,10 @@ get_id3 (const gchar *data,
 	const gchar *pos;
 	gchar buf[5];
 
+	if (!data) {
+		return FALSE;
+	}
+	
 	if (size < 128) {
 		return FALSE;
 	}