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udp: add missing WRITE_ONCE() around up->encap_rcv

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[ Upstream commit 6d5a12eb91 ]

UDP_ENCAP_ESPINUDP_NON_IKE setsockopt() writes over up->encap_rcv
while other cpus read it.

Fixes: 067b207b28 ("[UDP]: Cleanup UDP encapsulation code")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2023-09-12 09:17:25 +00:00 committed by Greg Kroah-Hartman
parent 67188b2e28
commit 268e92e323
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/udp.c
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@ -2675,10 +2675,12 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
case UDP_ENCAP_ESPINUDP_NON_IKE:
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == AF_INET6)
up->encap_rcv = ipv6_stub->xfrm6_udp_encap_rcv;
WRITE_ONCE(up->encap_rcv,
ipv6_stub->xfrm6_udp_encap_rcv);
else
#endif
up->encap_rcv = xfrm4_udp_encap_rcv;
WRITE_ONCE(up->encap_rcv,
xfrm4_udp_encap_rcv);
#endif
fallthrough;
case UDP_ENCAP_L2TPINUDP: