Set cred->user_ns in key_replace_session_keyring

Since this cred was not created with copy_creds(), it needs to get
initialized.  Otherwise use of syscall(__NR_keyctl, KEYCTL_SESSION_TO_PARENT);
can lead to a NULL deref.  Thanks to Robert for finding this.

But introduced by commit 47a150e ("Cache user_ns in struct cred").

Signed-off-by: Serge E. Hallyn <[email protected]>
Reported-by: Robert Święcki <[email protected]>
Cc: David Howells <[email protected]>
Cc: [email protected] (2.6.39)
Signed-off-by: Linus Torvalds <[email protected]>

security/keys/process_keys.c

@@ -847,6 +847,7 @@ void key_replace_session_keyring(void)
 	new-> sgid	= old-> sgid;
 	new->fsgid	= old->fsgid;
 	new->user	= get_uid(old->user);
+	new->user_ns	= new->user->user_ns;
 	new->group_info	= get_group_info(old->group_info);
 
 	new->securebits	= old->securebits;