sin6_scope_id should only be used if the address is link-local and otherwise ignored. Currently send6 uses the sin6_scope_id for flowi6_oif without a check of whether this is needed, so this can cause non-link local endpoints to use an incorrect device. Signed-off-by: Torin Carey --- drivers/net/wireguard/netlink.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/wireguard/netlink.c b/drivers/net/wireguard/netlink.c index 67f962eb8b46..738041f72c2b 100644 --- a/drivers/net/wireguard/netlink.c +++ b/drivers/net/wireguard/netlink.c @@ -453,6 +453,8 @@ static int set_peer(struct wg_device *wg, struct nlattr **attrs) wg_socket_set_peer_endpoint(peer, &endpoint); } else if (len == sizeof(struct sockaddr_in6) && addr->sa_family == AF_INET6) { endpoint.addr6 = *(struct sockaddr_in6 *)addr; + if (!__ipv6_addr_needs_scope_id(ipv6_addr_type(&endpoint.addr6.sin6_addr))) + endpoint.addr6.sin6_scope_id = 0; wg_socket_set_peer_endpoint(peer, &endpoint); } } base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585 -- 2.48.1