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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: Hannes Frederic Sowa <hannes@stressinduktion.org> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 2 additions and 2 deletions
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@ -116,8 +116,8 @@ static int ip6_finish_output2(struct sk_buff *skb)
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}
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rcu_read_unlock_bh();
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IP6_INC_STATS_BH(dev_net(dst->dev),
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ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
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IP6_INC_STATS(dev_net(dst->dev),
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ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
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kfree_skb(skb);
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return -EINVAL;
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}
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