From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
From: Yinjun Zhang <yinjun.zhang@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Simon Horman <simon.horman@xxxxxxxxxxxxx>
Signed-off-by: Louis Peens <louis.peens@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210225125102.23989-1-simon.horman@xxxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
}
