diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-09-12 16:02:11 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-09-15 10:33:48 +0100 |
| commit | 6b724bc4300b431443f3b99520994a5aece347cd (patch) | |
| tree | 02730c15dc86341705749df48ed87b7ca84688c1 /net/ipv6/udp.c | |
| parent | 83cd5eb654b320c1972254f243531f3f3cebcccf (diff) | |
| download | linux-6b724bc4300b431443f3b99520994a5aece347cd.tar.gz | |
ipv6: lockless IPV6_MTU_DISCOVER implementation
Most np->pmtudisc reads are racy.
Move this 3bit field on a full byte, add annotations
and make IPV6_MTU_DISCOVER setsockopt() lockless.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/udp.c')
| -rw-r--r-- | net/ipv6/udp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 90e873689b885c..c17e19fece1b8b 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -598,7 +598,7 @@ int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, if (!ip6_sk_accept_pmtu(sk)) goto out; ip6_sk_update_pmtu(skb, sk, info); - if (np->pmtudisc != IPV6_PMTUDISC_DONT) + if (READ_ONCE(np->pmtudisc) != IPV6_PMTUDISC_DONT) harderr = 1; } if (type == NDISC_REDIRECT) { |