Check for connection before trying to dereference a pointer

diff --git a/src/backend/pgxc/pool/poolmgr.c b/src/backend/pgxc/pool/poolmgr.c
index 4a756424a473cf4ced0e28c94fecb20e032f0685..c61f4211424ccb44a1bd61f5786fecbc49dbcc93 100644 (file)
--- a/src/backend/pgxc/pool/poolmgr.c
+++ b/src/backend/pgxc/pool/poolmgr.c
@@ -1373,6 +1373,9 @@ cancel_query_on_connections(PoolAgent *agent, List *datanodelist, List *coordlis
                if (agent->dn_connections == NULL)
                        break;
 
+               if (!agent->dn_connections[node])
+                       continue;
+
                bRet = PQcancel((PGcancel *) agent->dn_connections[node]->xc_cancelConn, errbuf, sizeof(errbuf));
                if (bRet != false)
                {
@@ -1391,6 +1394,9 @@ cancel_query_on_connections(PoolAgent *agent, List *datanodelist, List *coordlis
                if (agent->coord_connections == NULL)
                        break;
 
+               if (!agent->coord_connections[node])
+                       continue;
+
                bRet = PQcancel((PGcancel *) agent->coord_connections[node]->xc_cancelConn, errbuf, sizeof(errbuf));
                if (bRet != false)
                {