Add missing patch

0001-Avoid-path-traversal.patch

@@ -0,0 +1,52 @@
+From 0ccdf564b6a3e26522a8eb1858f1828844fa3536 Mon Sep 17 00:00:00 2001
+From: Stephen Kitt <steve@sk2.org>
+Date: Mon, 5 Jan 2015 06:28:00 +0000
+Subject: [PATCH] Avoid path traversal
+
+gcab suffers from a directory traversal bug: it doesn't filter leading
+slashes from paths in CAB files.
+(see https://bugs.debian.org/774580)
+
+The attached patch fixes this, at the cost of ugly paths when faced with
+relative traversals. At least all the CAB's contents can be extracted,
+without overwriting anything outside the extraction path.
+
+https://bugzilla.gnome.org/show_bug.cgi?id=742331
+---
+ libgcab/gcab-folder.c | 18 +++++++++++++++++-
+ 1 file changed, 17 insertions(+), 1 deletion(-)
+
+diff --git a/libgcab/gcab-folder.c b/libgcab/gcab-folder.c
+index a140e2c..9510cf3 100644
+--- a/libgcab/gcab-folder.c
++++ b/libgcab/gcab-folder.c
+@@ -362,9 +362,25 @@ gcab_folder_extract (GCabFolder *self,
+                 fname[i] = '/';
+ 
+         GFile *gfile = g_file_resolve_relative_path (path, fname);
+-        GFile *parent = g_file_get_parent (gfile);
+         g_free (fname);
+ 
++        if (!g_file_has_prefix (gfile, path)) {
++            // "Rebase" the file in the given path, to ensure we never escape it
++            char *rawpath = g_file_get_path (gfile);
++            if (rawpath != NULL) {
++                char *newpath = rawpath;
++                while (*newpath != 0 && *newpath == G_DIR_SEPARATOR) {
++                    newpath++;
++                }
++                GFile *newgfile = g_file_resolve_relative_path (path, newpath);
++                g_free (rawpath);
++                g_object_unref (gfile);
++                gfile = newgfile;
++            }
++        }
++
++        GFile *parent = g_file_get_parent (gfile);
++
+         if (!g_file_make_directory_with_parents (parent, cancellable, &my_error)) {
+             if (g_error_matches (my_error, G_IO_ERROR, G_IO_ERROR_EXISTS))
+                 g_clear_error (&my_error);
+-- 
+2.1.0
+