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netfilter: egress: avoid a lockdep splat

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include/linux/netfilter_netdev.h:97 suspicious rcu_dereference_check() usage!
2 locks held by sd-resolve/1100:
 0: ..(rcu_read_lock_bh){1:3}, at: ip_finish_output2
 1: ..(rcu_read_lock_bh){1:3}, at: __dev_queue_xmit
 __dev_queue_xmit+0 ..

The helper has two callers, one uses rcu_read_lock, the other
rcu_read_lock_bh().  Annotate the dereference to reflect this.

Fixes: 42df6e1d221dd ("netfilter: Introduce egress hook")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2022-01-07 15:46:16 +01:00 committed by Pablo Neira Ayuso
parent 408bdcfce8
commit 6316136ec6
1 changed files with 1 additions and 1 deletions
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2
include/linux/netfilter_netdev.h
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@ -94,7 +94,7 @@ static inline struct sk_buff *nf_hook_egress(struct sk_buff *skb, int *rc,
return skb;
#endif
e = rcu_dereference(dev->nf_hooks_egress);
e = rcu_dereference_check(dev->nf_hooks_egress, rcu_read_lock_bh_held());
if (!e)
return skb;