This attempts to avoid a situation where a misbehaving iscsi daemon passes a socket for a different iSCSI connection to BIND_CONN - which would result in infinite recursion and stack overflow. This will also prevent passing *other* sockets which had sk_user_data overridden, but that wouldn't have been safe anyways - since we throw away that pointer anyways. This does not cover all hypothetical scenarios where we pass bad sockets to BIND_CONN. This also papers over a different bug - we allow a daemon to call BIND_CONN twice for the same connection - which would result in, at the least, failing to uninitialize/teardown the previous socket, which will be addressed separately. Signed-off-by: Khazhismel Kumykov <khazhy@xxxxxxxxxx> --- drivers/scsi/iscsi_tcp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index 8e14cea15f98..e8ed60b777c6 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -725,7 +725,7 @@ iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, } err = -EINVAL; - if (!sk_is_tcp(sock->sk)) + if (!sk_is_tcp(sock->sk) || sock->sk->sk_user_data) goto free_socket; err = iscsi_conn_bind(cls_session, cls_conn, is_leading); -- 2.44.0.291.gc1ea87d7ee-goog
