From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Yinjun Zhang yinjun.zhang@corigine.com
commit a4fc088ad4ff4a99d01978aa41065132b574b4b2 upstream.
The command "ethtool -L <intf> combined 0" may clean the RX/TX channel count and skip the error path, since the attrs tb[ETHTOOL_A_CHANNELS_RX_COUNT] and tb[ETHTOOL_A_CHANNELS_TX_COUNT] are NULL in this case when recent ethtool is used.
Tested using ethtool v5.10.
Fixes: 7be92514b99c ("ethtool: check if there is at least one channel for TX/RX in the core") Signed-off-by: Yinjun Zhang yinjun.zhang@corigine.com Signed-off-by: Simon Horman simon.horman@netronome.com Signed-off-by: Louis Peens louis.peens@netronome.com Link: https://lore.kernel.org/r/20210225125102.23989-1-simon.horman@netronome.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ethtool/channels.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-)
--- a/net/ethtool/channels.c +++ b/net/ethtool/channels.c @@ -116,10 +116,9 @@ int ethnl_set_channels(struct sk_buff *s struct ethtool_channels channels = {}; struct ethnl_req_info req_info = {}; struct nlattr **tb = info->attrs; - const struct nlattr *err_attr; + u32 err_attr, max_rx_in_use = 0; const struct ethtool_ops *ops; struct net_device *dev; - u32 max_rx_in_use = 0; int ret;
ret = ethnl_parse_header_dev_get(&req_info, @@ -157,34 +156,35 @@ int ethnl_set_channels(struct sk_buff *s
/* ensure new channel counts are within limits */ if (channels.rx_count > channels.max_rx) - err_attr = tb[ETHTOOL_A_CHANNELS_RX_COUNT]; + err_attr = ETHTOOL_A_CHANNELS_RX_COUNT; else if (channels.tx_count > channels.max_tx) - err_attr = tb[ETHTOOL_A_CHANNELS_TX_COUNT]; + err_attr = ETHTOOL_A_CHANNELS_TX_COUNT; else if (channels.other_count > channels.max_other) - err_attr = tb[ETHTOOL_A_CHANNELS_OTHER_COUNT]; + err_attr = ETHTOOL_A_CHANNELS_OTHER_COUNT; else if (channels.combined_count > channels.max_combined) - err_attr = tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT]; + err_attr = ETHTOOL_A_CHANNELS_COMBINED_COUNT; else - err_attr = NULL; + err_attr = 0; if (err_attr) { ret = -EINVAL; - NL_SET_ERR_MSG_ATTR(info->extack, err_attr, + NL_SET_ERR_MSG_ATTR(info->extack, tb[err_attr], "requested channel count exceeds maximum"); goto out_ops; }
/* ensure there is at least one RX and one TX channel */ if (!channels.combined_count && !channels.rx_count) - err_attr = tb[ETHTOOL_A_CHANNELS_RX_COUNT]; + err_attr = ETHTOOL_A_CHANNELS_RX_COUNT; else if (!channels.combined_count && !channels.tx_count) - err_attr = tb[ETHTOOL_A_CHANNELS_TX_COUNT]; + err_attr = ETHTOOL_A_CHANNELS_TX_COUNT; else - err_attr = NULL; + err_attr = 0; if (err_attr) { if (mod_combined) - err_attr = tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT]; + err_attr = ETHTOOL_A_CHANNELS_COMBINED_COUNT; ret = -EINVAL; - NL_SET_ERR_MSG_ATTR(info->extack, err_attr, "requested channel counts would result in no RX or TX channel being configured"); + NL_SET_ERR_MSG_ATTR(info->extack, tb[err_attr], + "requested channel counts would result in no RX or TX channel being configured"); goto out_ops; }