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icmp: Fix a data-race around sysctl_icmp_ratelimit.
[ Upstream commit2a4eb71484
] While reading sysctl_icmp_ratelimit, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes:1da177e4c3
("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 2 additions and 1 deletions
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@ -333,7 +333,8 @@ static bool icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
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vif = l3mdev_master_ifindex(dst->dev);
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peer = inet_getpeer_v4(net->ipv4.peers, fl4->daddr, vif, 1);
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rc = inet_peer_xrlim_allow(peer, net->ipv4.sysctl_icmp_ratelimit);
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rc = inet_peer_xrlim_allow(peer,
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READ_ONCE(net->ipv4.sysctl_icmp_ratelimit));
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if (peer)
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inet_putpeer(peer);
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out:
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