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-rw-r--r--sysdeps/posix/cuserid.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/sysdeps/posix/cuserid.c b/sysdeps/posix/cuserid.c
index 11c827a686..f30c20e3f8 100644
--- a/sysdeps/posix/cuserid.c
+++ b/sysdeps/posix/cuserid.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1996, 1998, 1999, 2001 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 1996, 1998, 1999, 2001, 2010 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -44,5 +44,6 @@ cuserid (s)
 
   if (s == NULL)
     s = name;
-  return strncpy (s, pwptr->pw_name, L_cuserid);
+  s[L_userid - 1] = '\0';
+  return strncpy (s, pwptr->pw_name, L_cuserid - 1);
 }