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can: kvaser_usb: hydra: help gcc-13 to figure out cmd_len
Debian's gcc-13 [1] throws the following error in
kvaser_usb_hydra_cmd_size():
[1] gcc version 13.0.0 20221214 (experimental) [master r13-4693-g512098a3316] (Debian 13-20221214-1)
| drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c:502:65: error:
| array subscript ‘struct kvaser_cmd_ext[0]’ is partly outside array
| bounds of ‘unsigned char[32]’ [-Werror=array-bounds=]
| 502 | ret = le16_to_cpu(((struct kvaser_cmd_ext *)cmd)->len);
kvaser_usb_hydra_cmd_size() returns the size of given command. It
depends on the command number (cmd->header.cmd_no). For extended
commands (cmd->header.cmd_no == CMD_EXTENDED) the above shown code is
executed.
Help gcc to recognize that this code path is not taken in all cases,
by calling kvaser_usb_hydra_cmd_size() directly after assigning the
command number.
Fixes: aec5fb2268b7 ("can: kvaser_usb: Add support for Kvaser USB hydra family")
Cc: Jimmy Assarsson <extja@kvaser.com>
Cc: Anssi Hannula <anssi.hannula@bitwise.fi>
Link: https://lore.kernel.org/all/20221219110104.1073881-1-mkl@pengutronix.de
Tested-by: Jimmy Assarsson <extja@kvaser.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde
parent
3bc2afcba8
commit
f006229135
@ -545,6 +545,7 @@ static int kvaser_usb_hydra_send_simple_cmd(struct kvaser_usb *dev,
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u8 cmd_no, int channel)
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{
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struct kvaser_cmd *cmd;
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size_t cmd_len;
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int err;
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cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
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@ -552,6 +553,7 @@ static int kvaser_usb_hydra_send_simple_cmd(struct kvaser_usb *dev,
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return -ENOMEM;
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cmd->header.cmd_no = cmd_no;
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cmd_len = kvaser_usb_hydra_cmd_size(cmd);
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if (channel < 0) {
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kvaser_usb_hydra_set_cmd_dest_he
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(cmd, KVASER_USB_HYDRA_HE_ADDRESS_ILLEGAL);
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@ -568,7 +570,7 @@ static int kvaser_usb_hydra_send_simple_cmd(struct kvaser_usb *dev,
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kvaser_usb_hydra_set_cmd_transid
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(cmd, kvaser_usb_hydra_get_next_transid(dev));
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err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
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err = kvaser_usb_send_cmd(dev, cmd, cmd_len);
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if (err)
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goto end;
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@ -584,6 +586,7 @@ kvaser_usb_hydra_send_simple_cmd_async(struct kvaser_usb_net_priv *priv,
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{
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struct kvaser_cmd *cmd;
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struct kvaser_usb *dev = priv->dev;
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size_t cmd_len;
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int err;
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cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
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@ -591,14 +594,14 @@ kvaser_usb_hydra_send_simple_cmd_async(struct kvaser_usb_net_priv *priv,
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return -ENOMEM;
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cmd->header.cmd_no = cmd_no;
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cmd_len = kvaser_usb_hydra_cmd_size(cmd);
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kvaser_usb_hydra_set_cmd_dest_he
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(cmd, dev->card_data.hydra.channel_to_he[priv->channel]);
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kvaser_usb_hydra_set_cmd_transid
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(cmd, kvaser_usb_hydra_get_next_transid(dev));
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err = kvaser_usb_send_cmd_async(priv, cmd,
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kvaser_usb_hydra_cmd_size(cmd));
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err = kvaser_usb_send_cmd_async(priv, cmd, cmd_len);
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if (err)
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kfree(cmd);
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@ -742,6 +745,7 @@ static int kvaser_usb_hydra_get_single_capability(struct kvaser_usb *dev,
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{
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struct kvaser_usb_dev_card_data *card_data = &dev->card_data;
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struct kvaser_cmd *cmd;
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size_t cmd_len;
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u32 value = 0;
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u32 mask = 0;
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u16 cap_cmd_res;
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@ -753,13 +757,14 @@ static int kvaser_usb_hydra_get_single_capability(struct kvaser_usb *dev,
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return -ENOMEM;
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cmd->header.cmd_no = CMD_GET_CAPABILITIES_REQ;
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cmd_len = kvaser_usb_hydra_cmd_size(cmd);
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cmd->cap_req.cap_cmd = cpu_to_le16(cap_cmd_req);
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kvaser_usb_hydra_set_cmd_dest_he(cmd, card_data->hydra.sysdbg_he);
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kvaser_usb_hydra_set_cmd_transid
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(cmd, kvaser_usb_hydra_get_next_transid(dev));
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err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
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err = kvaser_usb_send_cmd(dev, cmd, cmd_len);
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if (err)
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goto end;
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@ -1578,6 +1583,7 @@ static int kvaser_usb_hydra_get_busparams(struct kvaser_usb_net_priv *priv,
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struct kvaser_usb *dev = priv->dev;
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struct kvaser_usb_net_hydra_priv *hydra = priv->sub_priv;
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struct kvaser_cmd *cmd;
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size_t cmd_len;
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int err;
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if (!hydra)
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@ -1588,6 +1594,7 @@ static int kvaser_usb_hydra_get_busparams(struct kvaser_usb_net_priv *priv,
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return -ENOMEM;
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cmd->header.cmd_no = CMD_GET_BUSPARAMS_REQ;
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cmd_len = kvaser_usb_hydra_cmd_size(cmd);
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kvaser_usb_hydra_set_cmd_dest_he
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(cmd, dev->card_data.hydra.channel_to_he[priv->channel]);
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kvaser_usb_hydra_set_cmd_transid
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@ -1597,7 +1604,7 @@ static int kvaser_usb_hydra_get_busparams(struct kvaser_usb_net_priv *priv,
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reinit_completion(&priv->get_busparams_comp);
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err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
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err = kvaser_usb_send_cmd(dev, cmd, cmd_len);
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if (err)
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return err;
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@ -1624,6 +1631,7 @@ static int kvaser_usb_hydra_set_bittiming(const struct net_device *netdev,
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struct kvaser_cmd *cmd;
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struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
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struct kvaser_usb *dev = priv->dev;
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size_t cmd_len;
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int err;
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cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
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@ -1631,6 +1639,7 @@ static int kvaser_usb_hydra_set_bittiming(const struct net_device *netdev,
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return -ENOMEM;
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cmd->header.cmd_no = CMD_SET_BUSPARAMS_REQ;
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cmd_len = kvaser_usb_hydra_cmd_size(cmd);
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memcpy(&cmd->set_busparams_req.busparams_nominal, busparams,
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sizeof(cmd->set_busparams_req.busparams_nominal));
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@ -1639,7 +1648,7 @@ static int kvaser_usb_hydra_set_bittiming(const struct net_device *netdev,
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kvaser_usb_hydra_set_cmd_transid
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(cmd, kvaser_usb_hydra_get_next_transid(dev));
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err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
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err = kvaser_usb_send_cmd(dev, cmd, cmd_len);
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kfree(cmd);
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@ -1652,6 +1661,7 @@ static int kvaser_usb_hydra_set_data_bittiming(const struct net_device *netdev,
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struct kvaser_cmd *cmd;
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struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
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struct kvaser_usb *dev = priv->dev;
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size_t cmd_len;
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int err;
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cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
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@ -1659,6 +1669,7 @@ static int kvaser_usb_hydra_set_data_bittiming(const struct net_device *netdev,
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return -ENOMEM;
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cmd->header.cmd_no = CMD_SET_BUSPARAMS_FD_REQ;
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cmd_len = kvaser_usb_hydra_cmd_size(cmd);
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memcpy(&cmd->set_busparams_req.busparams_data, busparams,
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sizeof(cmd->set_busparams_req.busparams_data));
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@ -1676,7 +1687,7 @@ static int kvaser_usb_hydra_set_data_bittiming(const struct net_device *netdev,
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kvaser_usb_hydra_set_cmd_transid
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(cmd, kvaser_usb_hydra_get_next_transid(dev));
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err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
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err = kvaser_usb_send_cmd(dev, cmd, cmd_len);
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kfree(cmd);
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@ -1804,6 +1815,7 @@ static int kvaser_usb_hydra_get_software_info(struct kvaser_usb *dev)
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static int kvaser_usb_hydra_get_software_details(struct kvaser_usb *dev)
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{
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struct kvaser_cmd *cmd;
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size_t cmd_len;
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int err;
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u32 flags;
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struct kvaser_usb_dev_card_data *card_data = &dev->card_data;
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@ -1813,6 +1825,7 @@ static int kvaser_usb_hydra_get_software_details(struct kvaser_usb *dev)
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return -ENOMEM;
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cmd->header.cmd_no = CMD_GET_SOFTWARE_DETAILS_REQ;
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cmd_len = kvaser_usb_hydra_cmd_size(cmd);
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cmd->sw_detail_req.use_ext_cmd = 1;
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kvaser_usb_hydra_set_cmd_dest_he
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(cmd, KVASER_USB_HYDRA_HE_ADDRESS_ILLEGAL);
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@ -1820,7 +1833,7 @@ static int kvaser_usb_hydra_get_software_details(struct kvaser_usb *dev)
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kvaser_usb_hydra_set_cmd_transid
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(cmd, kvaser_usb_hydra_get_next_transid(dev));
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err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
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err = kvaser_usb_send_cmd(dev, cmd, cmd_len);
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if (err)
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goto end;
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@ -1938,6 +1951,7 @@ static int kvaser_usb_hydra_set_opt_mode(const struct kvaser_usb_net_priv *priv)
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{
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struct kvaser_usb *dev = priv->dev;
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struct kvaser_cmd *cmd;
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size_t cmd_len;
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int err;
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if ((priv->can.ctrlmode &
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@ -1953,6 +1967,7 @@ static int kvaser_usb_hydra_set_opt_mode(const struct kvaser_usb_net_priv *priv)
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return -ENOMEM;
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cmd->header.cmd_no = CMD_SET_DRIVERMODE_REQ;
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cmd_len = kvaser_usb_hydra_cmd_size(cmd);
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kvaser_usb_hydra_set_cmd_dest_he
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(cmd, dev->card_data.hydra.channel_to_he[priv->channel]);
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kvaser_usb_hydra_set_cmd_transid
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@ -1962,7 +1977,7 @@ static int kvaser_usb_hydra_set_opt_mode(const struct kvaser_usb_net_priv *priv)
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else
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cmd->set_ctrlmode.mode = KVASER_USB_HYDRA_CTRLMODE_NORMAL;
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err = kvaser_usb_send_cmd(dev, cmd, kvaser_usb_hydra_cmd_size(cmd));
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err = kvaser_usb_send_cmd(dev, cmd, cmd_len);
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kfree(cmd);
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return err;
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