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| author | Eric Dumazet <edumazet@google.com> | 2023-09-12 16:02:01 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-09-15 10:33:46 +0100 |
| commit | 2da23eb07c91241d962f3ff05565065484cd8929 (patch) | |
| tree | 921417255db7f2389304c5f21aac9c828b58caa8 /net/dccp | |
| parent | d986f52124e062753e33b6fe303be5904a997eac (diff) | |
| download | linux-2da23eb07c91241d962f3ff05565065484cd8929.tar.gz linux-2da23eb07c91241d962f3ff05565065484cd8929.tar.bz2 linux-2da23eb07c91241d962f3ff05565065484cd8929.zip | |
ipv6: lockless IPV6_MULTICAST_HOPS implementation
This fixes data-races around np->mcast_hops,
and make IPV6_MULTICAST_HOPS lockless.
Note that np->mcast_hops is never negative,
thus can fit an u8 field instead of s16.
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/dccp')
| -rw-r--r-- | net/dccp/ipv6.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c index 33f6ccf6ba77..83617a16b98e 100644 --- a/net/dccp/ipv6.c +++ b/net/dccp/ipv6.c @@ -676,7 +676,7 @@ ipv6_pktoptions: if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) np->mcast_oif = inet6_iif(opt_skb); if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) - np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; + WRITE_ONCE(np->mcast_hops, ipv6_hdr(opt_skb)->hop_limit); if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); if (np->repflow) |