Handle the case where the skb for an IPv6 packet contains a 0 in the secmark for a packet generated locally. This can only happen for system packets, so allow the access. Signed-off-by: Casey Schaufler <casey(a)schaufler-ca.com&gt; --- security/smack/smack_lsm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index bd45c9139d34..b9abcdb36a73 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -3907,6 +3907,8 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) #ifdef SMACK_IPV6_SECMARK_LABELING if (skb && skb->secmark != 0) skp = smack_from_secid(skb->secmark); + else if (smk_ipv6_localhost(&sadd)) + break; else skp = smack_ipv6host_label(&sadd); if (skp == NULL) -- 2.19.1