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authorEric Dumazet <edumazet@google.com>2023-09-12 16:02:01 +0000
committerDavid S. Miller <davem@davemloft.net>2023-09-15 10:33:46 +0100
commit2da23eb07c91241d962f3ff05565065484cd8929 (patch)
tree921417255db7f2389304c5f21aac9c828b58caa8 /net/dccp
parentd986f52124e062753e33b6fe303be5904a997eac (diff)
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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.c2
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)