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Commit 15529811 authored by Eric Dumazet's avatar Eric Dumazet Committed by Greg Kroah-Hartman
Browse files

ipv4: use RCU protection in rt_is_expired() 



[ Upstream commit dd205fcc33d92d54eee4d7f21bb073af9bd5ce2b ]

rt_is_expired() must use RCU protection to make
sure the net structure it reads does not disappear.

Fixes: e84f84f2 ("netns: place rt_genid into struct net")
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Reviewed-by: default avatarKuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250205155120.1676781-6-edumazet@google.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 7f86ac1f

net/ipv4/route.c

+7 −1
Original line number Diff line number Diff line
@@ -423,7 +423,13 @@ static inline int ip_rt_proc_init(void) 


static inline bool rt_is_expired(const struct rtable *rth)

{

	return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev));

	bool res;



	rcu_read_lock();

	res = rth->rt_genid != rt_genid_ipv4(dev_net_rcu(rth->dst.dev));

	rcu_read_unlock();



	return res;

}



void rt_cache_flush(struct net *net)