check statichandle before attaching

it is possible for udp_recv_cb() to fire after the socket
is already shutting down and statichandle is NULL; we need to
create a temporary handle in this case.

diff --git a/lib/isc/netmgr/netmgr.c b/lib/isc/netmgr/netmgr.c
index 9b884e0a939300223a87710dca514dc887c0e35d..10b0d2345767346792b938ab7d51ba27ad4fce30 100644 (file)
--- a/lib/isc/netmgr/netmgr.c
+++ b/lib/isc/netmgr/netmgr.c
@@ -2144,7 +2144,7 @@ isc__nm_get_read_req(isc_nmsocket_t *sock, isc_sockaddr_t *sockaddr) {
                isc_nmhandle_attach(sock->statichandle, &req->handle);
                break;
        default:
-               if (atomic_load(&sock->client)) {
+               if (atomic_load(&sock->client) && sock->statichandle != NULL) {
                        isc_nmhandle_attach(sock->statichandle, &req->handle);
                } else {
                        req->handle = isc__nmhandle_get(sock, sockaddr, NULL);