rtnetlink: Lock sock_net(skb->sk) in rtnl_newlink().

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There are a few cases where rtnl_net_lock() is not properly
held in rtnl_newlink().

When either of IFLA_NET_NS_PID / IFLA_NET_NS_FD / IFLA_TARGET_NETNSID
is specified but IFLA_LINK_NETNSID is not, sock_net(skb->sk) is used
as link_net in rtnl_newlink_link_net().

In addition, the do_setlink() path uses sock_net(skb->sk) and one
from the three netns attributes while rtnl_link_get_net_capable()
returns only one of four.

Let's add sock_net(skb->sk) to rtnl_nets in rtnl_newlink().

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260703001009.1572444-2-kuniyu@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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Kuniyuki Iwashima 2026-07-03 00:09:12 +00:00 • committed by Paolo Abeni

parent 23dad2d088

commit 5ecbbb179e

1 changed files with 6 additions and 3 deletions

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net/core/rtnetlink.c

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