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sctp: read sk->sk_bound_dev_if once in sctp_rcv()

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[ Upstream commit a20ea298071f46effa3aaf965bf9bb34c901db3f ]

sctp_rcv() reads sk->sk_bound_dev_if twice while the socket
is not locked. Another cpu could change this field under us.

Fixes: 0fd9a65a76e8 ("[SCTP] Support SO_BINDTODEVICE socket option on incoming packets.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2022-05-13 11:55:42 -07:00 committed by Greg Kroah-Hartman
parent 3447838751
commit b342a88bbc
1 changed files with 3 additions and 1 deletions
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4
net/sctp/input.c
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@ -103,6 +103,7 @@ int sctp_rcv(struct sk_buff *skb)
struct sctp_chunk *chunk;
union sctp_addr src;
union sctp_addr dest;
int bound_dev_if;
int family;
struct sctp_af *af;
struct net *net = dev_net(skb->dev);
@ -180,7 +181,8 @@ int sctp_rcv(struct sk_buff *skb)
* If a frame arrives on an interface and the receiving socket is
* bound to another interface, via SO_BINDTODEVICE, treat it as OOTB
*/
if (sk->sk_bound_dev_if && (sk->sk_bound_dev_if != af->skb_iif(skb))) {
bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
if (bound_dev_if && (bound_dev_if != af->skb_iif(skb))) {
if (transport) {
sctp_transport_put(transport);
asoc = NULL;