audit: fix incorrect set of audit_sock

NETLINK_CB(skb).sk is the socket of user space process,
netlink_unicast in kauditd_send_skb wants the kernel
side socket. Since the sk_state of audit netlink socket
is not NETLINK_CONNECTED, so the netlink_getsockbyportid
doesn't return -ECONNREFUSED.

And the socket of userspace process can be released anytime,
so the audit_sock may point to invalid socket.

this patch sets the audit_sock to the kernel side audit
netlink socket.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

diff --git a/kernel/audit.c b/kernel/audit.c
index b27b7063654ce79298a88a3c2cb4c3cd93838ec3..ef5bd63f5cb8b2f196427a76be9794f25973896e 100644 (file)
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -821,7 +821,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
                                audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
                        audit_pid = new_pid;
                        audit_nlk_portid = NETLINK_CB(skb).portid;
-                       audit_sock = NETLINK_CB(skb).sk;
+                       audit_sock = skb->sk;
                }
                if (s.mask & AUDIT_STATUS_RATE_LIMIT) {
                        err = audit_set_rate_limit(s.rate_limit);