Re: netlink: GPF in sock_sndtimeo

I also tried to extend Cong Wang's idea to attempt to proactively respond to a NETLINK_URELEASE on the audit_sock and reset it, but ran into a locking error stack dump using mutex_lock(&audit_cmd_mutex) in the notifier callback. Eliminating the lock since the sock is dead anways eliminates the error. Is it safe? I'll resubmit if this looks remotely sane. Meanwhile I'll try to get the test case to compile.

@@ -1167,10 +1190,14 @@ static void __net_exit audit_net_exit(struct net *net) { struct audit_net *aunet = net_generic(net, audit_net_id); struct sock *sock = aunet->nlsk; + + mutex_lock(&audit_cmd_mutex); if (sock == audit_sock) { audit_pid = 0; + audit_nlk_portid = 0; audit_sock = NULL; } + mutex_unlock(&audit_cmd_mutex);