Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7f88c6b2 authored by Hannes Frederic Sowa's avatar Hannes Frederic Sowa Committed by David S. Miller
Browse files

ipv6: fix possible seqlock deadlock in ip6_finish_output2 



IPv6 stats are 64 bits and thus are protected with a seqlock. By not
disabling bottom-half we could deadlock here if we don't disable bh and
a softirq reentrantly updates the same mib.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 696701b8

net/ipv6/ip6_output.c

+2 −2
Original line number Diff line number Diff line
@@ -116,7 +116,7 @@ static int ip6_finish_output2(struct sk_buff *skb) 
	}

	rcu_read_unlock_bh();



	IP6_INC_STATS_BH(dev_net(dst->dev),

	IP6_INC_STATS(dev_net(dst->dev),

		      ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);

	kfree_skb(skb);

	return -EINVAL;