typefind: bounds check windows ico detection

Fixes out of bounds read

https://bugzilla.gnome.org/show_bug.cgi?id=774902

diff --git a/gst/typefind/gsttypefindfunctions.c b/gst/typefind/gsttypefindfunctions.c
index 7cac6bd..d790445 100644 (file)
--- a/gst/typefind/gsttypefindfunctions.c
+++ b/gst/typefind/gsttypefindfunctions.c
@@ -5224,6 +5224,8 @@ windows_icon_typefind (GstTypeFind * find, gpointer user_data)
   gint32 size, offset;
 
   datalen = gst_type_find_get_length (find);
+  if (datalen < 18)
+    return;
   if ((data = gst_type_find_peek (find, 0, 6)) == NULL)
     return;