From 3732db294ea30fe22dafb01fc9bbd1ac5e3f5f59 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ludvig=20P=C3=A4rsson?= Date: Wed, 17 Jan 2024 13:03:14 +0100 Subject: [PATCH] ethtool: netlink: Add missing ethnl_ops_begin/complete MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit [ Upstream commit f1172f3ee3a98754d95b968968920a7d03fdebcc ] 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: 0980bfcd6954 ("ethtool: set netdev features with FEATURES_SET request") Signed-off-by: Ludvig Pärsson Link: https://lore.kernel.org/r/20240117-etht2-v2-1-1a96b6e8c650@axis.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/ethtool/features.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/net/ethtool/features.c b/net/ethtool/features.c index 1c9f4df273bd..faccab84d865 100644 --- a/net/ethtool/features.c +++ b/net/ethtool/features.c @@ -235,17 +235,20 @@ 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 */ @@ -282,6 +285,8 @@ 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(); dev_put(dev);