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authorEric Dumazet <edumazet@google.com>2023-09-12 19:02:12 +0300
committerDavid S. Miller <davem@davemloft.net>2023-09-15 12:33:48 +0300
commit859f8b265fc2a11af0fb0c52b4087e0409250592 (patch)
tree7096c954f2073480a2cb52ef4e443bac1b336679 /net/sctp/ipv6.c
parent6b724bc4300b431443f3b99520994a5aece347cd (diff)
downloadlinux-859f8b265fc2a11af0fb0c52b4087e0409250592.tar.xz
ipv6: lockless IPV6_FLOWINFO_SEND implementation
np->sndflow reads are racy. Use one bit ftom atomic inet->inet_flags instead, IPV6_FLOWINFO_SEND setsockopt() can be 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/sctp/ipv6.c')
-rw-r--r--net/sctp/ipv6.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index 42b5b853ea01..5c0ed5909d85 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -296,7 +296,8 @@ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK)
fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK);
- if (np->sndflow && (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) {
+ if (inet6_test_bit(SNDFLOW, sk) &&
+ (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) {
struct ip6_flowlabel *flowlabel;
flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);