[SCSI] be2iscsi: fix null ptr ref in conn get param

The ep_disconnect function could be freeing the ep
while beiscsi_conn_get_param is running. This has
the driver use the get ep param callback instead
of the get conn param to fix this.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/scsi/be2iscsi/be_iscsi.c

@@ -210,28 +210,20 @@ int beiscsi_conn_bind(struct iscsi_cls_session *cls_session,
 }
 
 /**
- * beiscsi_conn_get_param - get the iscsi parameter
- * @cls_conn: pointer to iscsi cls conn
+ * beiscsi_ep_get_param - get the iscsi parameter
+ * @ep: pointer to iscsi ep
  * @param: parameter type identifier
  * @buf: buffer pointer
  *
  * returns iscsi parameter
  */
-int beiscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
+int beiscsi_ep_get_param(struct iscsi_endpoint *ep,
 			   enum iscsi_param param, char *buf)
 {
-	struct beiscsi_endpoint *beiscsi_ep;
-	struct iscsi_conn *conn = cls_conn->dd_data;
-	struct beiscsi_conn *beiscsi_conn = conn->dd_data;
+	struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
 	int len = 0;
 
 	SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_get_param, param= %d\n", param);
-	beiscsi_ep = beiscsi_conn->ep;
-	if (!beiscsi_ep) {
-		SE_DEBUG(DBG_LVL_1,
-			 "In beiscsi_conn_get_param , no beiscsi_ep\n");
-		return -ENODEV;
-	}
 
 	switch (param) {
 	case ISCSI_PARAM_CONN_PORT:
@@ -244,7 +236,7 @@ int beiscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
 			len = sprintf(buf, "%pI6\n", &beiscsi_ep->dst6_addr);
 		break;
 	default:
-		return iscsi_conn_get_param(cls_conn, param, buf);
+		return -ENOSYS;
 	}
 	return len;
 }

drivers/scsi/be2iscsi/be_iscsi.h

@@ -48,8 +48,8 @@ int beiscsi_conn_bind(struct iscsi_cls_session *cls_session,
 		      struct iscsi_cls_conn *cls_conn,
 		      uint64_t transport_fd, int is_leading);
 
-int beiscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
-			   enum iscsi_param param, char *buf);
+int beiscsi_ep_get_param(struct iscsi_endpoint *ep, enum iscsi_param param,
+			 char *buf);
 
 int beiscsi_get_host_param(struct Scsi_Host *shost,
 			   enum iscsi_host_param param, char *buf);

drivers/scsi/be2iscsi/be_main.c

@@ -4384,7 +4384,7 @@ struct iscsi_transport beiscsi_iscsi_transport = {
 	.bind_conn = beiscsi_conn_bind,
 	.destroy_conn = iscsi_conn_teardown,
 	.set_param = beiscsi_set_param,
-	.get_conn_param = beiscsi_conn_get_param,
+	.get_conn_param = iscsi_conn_get_param,
 	.get_session_param = iscsi_session_get_param,
 	.get_host_param = beiscsi_get_host_param,
 	.start_conn = beiscsi_conn_start,
@@ -4395,6 +4395,7 @@ struct iscsi_transport beiscsi_iscsi_transport = {
 	.alloc_pdu = beiscsi_alloc_pdu,
 	.parse_pdu_itt = beiscsi_parse_pdu,
 	.get_stats = beiscsi_conn_get_stats,
+	.get_ep_param = beiscsi_ep_get_param,
 	.ep_connect = beiscsi_ep_connect,
 	.ep_poll = beiscsi_ep_poll,
 	.ep_disconnect = beiscsi_ep_disconnect,