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ethtool: netlink: Add missing ethnl_ops_begin/complete

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Accessing an ethernet device that is powered off or clock gated might
cause the CPU to hang. Add ethnl_ops_begin/complete in
ethnl_set_features() to protect against this.

Fixes: 0980bfcd69 ("ethtool: set netdev features with FEATURES_SET request")
Signed-off-by: Ludvig Pärsson <ludvig.parsson@axis.com>
Link: https://lore.kernel.org/r/20240117-etht2-v2-1-1a96b6e8c650@axis.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Ludvig Pärsson 2024-01-17 13:03:14 +01:00 committed by Paolo Abeni
parent dd2d40acdb
commit f1172f3ee3
1 changed files with 7 additions and 2 deletions
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9
net/ethtool/features.c
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@ -234,17 +234,20 @@ int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
dev = req_info.dev;
rtnl_lock();
ret = ethnl_ops_begin(dev);
if (ret < 0)
goto out_rtnl;
ethnl_features_to_bitmap(old_active, dev->features);
ethnl_features_to_bitmap(old_wanted, dev->wanted_features);
ret = ethnl_parse_bitset(req_wanted, req_mask, NETDEV_FEATURE_COUNT,
tb[ETHTOOL_A_FEATURES_WANTED],
netdev_features_strings, info->extack);
if (ret < 0)
goto out_rtnl;
goto out_ops;
if (ethnl_bitmap_to_features(req_mask) & ~NETIF_F_ETHTOOL_BITS) {
GENL_SET_ERR_MSG(info, "attempt to change non-ethtool features");
ret = -EINVAL;
goto out_rtnl;
goto out_ops;
}
/* set req_wanted bits not in req_mask from old_wanted */
@ -281,6 +284,8 @@ int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
if (mod)
netdev_features_change(dev);
out_ops:
ethnl_ops_complete(dev);
out_rtnl:
rtnl_unlock();
ethnl_parse_header_dev_put(&req_info);