(fshelp_fetch_root): Make sure the returned fsys control port is valid.

1 files changed, 5 insertions, 1 deletions

diff --git a/libfshelp/fetch-root.c b/libfshelp/fetch-root.c
index 1daaa202..1504204f 100644
--- a/libfshelp/fetch-root.c
+++ b/libfshelp/fetch-root.c
@@ -150,7 +150,11 @@ fshelp_fetch_root (struct transbox *box, void *cookie,
 
       if (err)
 	return err;
-      
+
+      if (! MACH_PORT_VALID (control))
+	/* The start translator succeeded, but it returned a bogus port.  */
+	return EDIED;
+
       box->active = control;
     }