Commit a20ea298 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller

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

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

Fixes: 0fd9a65a ("[SCTP] Support SO_BINDTODEVICE socket option on incoming packets.")
Signed-off-by: default avatarEric 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: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4c971d2f
...@@ -92,6 +92,7 @@ int sctp_rcv(struct sk_buff *skb) ...@@ -92,6 +92,7 @@ int sctp_rcv(struct sk_buff *skb)
struct sctp_chunk *chunk; struct sctp_chunk *chunk;
union sctp_addr src; union sctp_addr src;
union sctp_addr dest; union sctp_addr dest;
int bound_dev_if;
int family; int family;
struct sctp_af *af; struct sctp_af *af;
struct net *net = dev_net(skb->dev); struct net *net = dev_net(skb->dev);
...@@ -169,7 +170,8 @@ int sctp_rcv(struct sk_buff *skb) ...@@ -169,7 +170,8 @@ int sctp_rcv(struct sk_buff *skb)
* If a frame arrives on an interface and the receiving socket is * If a frame arrives on an interface and the receiving socket is
* bound to another interface, via SO_BINDTODEVICE, treat it as OOTB * 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) { if (transport) {
sctp_transport_put(transport); sctp_transport_put(transport);
asoc = NULL; asoc = NULL;
......
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