tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kspp/array-bounds/next-20210816/v1 head: b07d5e8190ca172b1ffddd1412b921296000b379 commit: 3b3fe3f0ff785b437a70e29fd96037e46972968a [7/10] treewide: Replace open-coded flex arrays in unions config: i386-randconfig-a012-20210816 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d2b574a4dea5b718e4386bf2e26af0126e5978ce) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id... git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git git fetch --no-tags kees kspp/array-bounds/next-20210816/v1 git checkout 3b3fe3f0ff785b437a70e29fd96037e46972968a # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=i386 SHELL=/bin/bash drivers/char/ drivers/net/can/usb/etas_es58x/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): tx_can_msg = (typeof(tx_can_msg))&es581_4_urb_cmd->raw_msg[msg_len]; ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~ 1 error generated. vim +374 drivers/net/can/usb/etas_es58x/es581_4.c 1dfb6005a60b13 Vincent Mailhol 2021-04-10 342 1dfb6005a60b13 Vincent Mailhol 2021-04-10 343 static int es581_4_tx_can_msg(struct es58x_priv *priv, 1dfb6005a60b13 Vincent Mailhol 2021-04-10 344 const struct sk_buff *skb) 1dfb6005a60b13 Vincent Mailhol 2021-04-10 345 { 1dfb6005a60b13 Vincent Mailhol 2021-04-10 346 struct es58x_device *es58x_dev = priv->es58x_dev; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 347 union es58x_urb_cmd *urb_cmd = priv->tx_urb->transfer_buffer; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 348 struct es581_4_urb_cmd *es581_4_urb_cmd = &urb_cmd->es581_4_urb_cmd; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 349 struct can_frame *cf = (struct can_frame *)skb->data; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 350 struct es581_4_tx_can_msg *tx_can_msg; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 351 u16 msg_len; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 352 int ret; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 353 1dfb6005a60b13 Vincent Mailhol 2021-04-10 354 if (can_is_canfd_skb(skb)) 1dfb6005a60b13 Vincent Mailhol 2021-04-10 355 return -EMSGSIZE; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 356 1dfb6005a60b13 Vincent Mailhol 2021-04-10 357 if (priv->tx_can_msg_cnt == 0) { 7fcecf51c18fa7 Vincent Mailhol 2021-06-29 358 msg_len = sizeof(es581_4_urb_cmd->bulk_tx_can_msg.num_can_msg); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 359 es581_4_fill_urb_header(urb_cmd, ES581_4_CAN_COMMAND_TYPE, 1dfb6005a60b13 Vincent Mailhol 2021-04-10 360 ES581_4_CMD_ID_TX_MSG, 1dfb6005a60b13 Vincent Mailhol 2021-04-10 361 priv->channel_idx, msg_len); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 362 es581_4_urb_cmd->bulk_tx_can_msg.num_can_msg = 0; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 363 } else { 1dfb6005a60b13 Vincent Mailhol 2021-04-10 364 msg_len = es581_4_get_msg_len(urb_cmd); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 365 } 1dfb6005a60b13 Vincent Mailhol 2021-04-10 366 1dfb6005a60b13 Vincent Mailhol 2021-04-10 367 ret = es58x_check_msg_max_len(es58x_dev->dev, 1dfb6005a60b13 Vincent Mailhol 2021-04-10 368 es581_4_urb_cmd->bulk_tx_can_msg, 1dfb6005a60b13 Vincent Mailhol 2021-04-10 369 msg_len + sizeof(*tx_can_msg)); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 370 if (ret) 1dfb6005a60b13 Vincent Mailhol 2021-04-10 371 return ret; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 372 1dfb6005a60b13 Vincent Mailhol 2021-04-10 373 /* Fill message contents. */ f4f5247daa45ee Vincent Mailhol 2021-06-29 @374 tx_can_msg = (typeof(tx_can_msg))&es581_4_urb_cmd->raw_msg[msg_len]; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 375 put_unaligned_le32(es58x_get_raw_can_id(cf), &tx_can_msg->can_id); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 376 put_unaligned_le32(priv->tx_head, &tx_can_msg->packet_idx); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 377 put_unaligned_le16((u16)es58x_get_flags(skb), &tx_can_msg->flags); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 378 tx_can_msg->channel_no = priv->channel_idx + ES581_4_CHANNEL_IDX_OFFSET; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 379 tx_can_msg->dlc = can_get_cc_dlc(cf, priv->can.ctrlmode); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 380 1dfb6005a60b13 Vincent Mailhol 2021-04-10 381 memcpy(tx_can_msg->data, cf->data, cf->len); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 382 1dfb6005a60b13 Vincent Mailhol 2021-04-10 383 /* Calculate new sizes. */ 1dfb6005a60b13 Vincent Mailhol 2021-04-10 384 es581_4_urb_cmd->bulk_tx_can_msg.num_can_msg++; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 385 msg_len += es581_4_sizeof_rx_tx_msg(*tx_can_msg); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 386 priv->tx_urb->transfer_buffer_length = es58x_get_urb_cmd_len(es58x_dev, 1dfb6005a60b13 Vincent Mailhol 2021-04-10 387 msg_len); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 388 es581_4_urb_cmd->msg_len = cpu_to_le16(msg_len); 1dfb6005a60b13 Vincent Mailhol 2021-04-10 389 1dfb6005a60b13 Vincent Mailhol 2021-04-10 390 return 0; 1dfb6005a60b13 Vincent Mailhol 2021-04-10 391 } 1dfb6005a60b13 Vincent Mailhol 2021-04-10 392 :::::: The code at line 374 was first introduced by commit :::::: f4f5247daa45eef07b1779195fa8d65f19c2eb5f can: etas_es58x: rewrite the message cast in es58{1,_fd}_tx_can_msg to increase readability :::::: TO: Vincent Mailhol <mailhol.vincent(a)wanadoo.fr&gt; :::::: CC: Marc Kleine-Budde <mkl(a)pengutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org