1 files changed, 7 insertions, 3 deletions
diff --git a/hurd/fd-write.c b/hurd/fd-write.c
index 797880756b..2f070c5c5a 100644
--- a/hurd/fd-write.c
+++ b/hurd/fd-write.c
@@ -34,9 +34,13 @@ _hurd_fd_write (struct hurd_fd *fd,
     }
 
   err = HURD_FD_PORT_USE_CANCEL (fd, _hurd_ctty_output (port, ctty, writefd));
+  if (err)
+    return err;
 
-  if (! err)
-    *nbytes = wrote;
+  if (__glibc_unlikely (wrote > *nbytes))	/* Sanity check for bogus server.  */
+    return EGRATUITOUS;
 
-  return err;
+  *nbytes = wrote;
+
+  return 0;
 }