Bluetooth: fix oops in l2cap_connect_req

In error cases when the ACL is insecure or we fail to allocate a new
struct sock, we jump to the "response" label.  If so, "sk" will be
null and the kernel crashes.

Signed-off-by: Nathan Holstein <nathan.holstein@gmail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 0b54b7dd84010a52147a54155c4f8db2b61752a7..dc6020570a3202423aa53feafc1ac41584c58983 100644 (file)
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -2891,7 +2891,7 @@ static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hd
        struct l2cap_chan_list *list = &conn->chan_list;
        struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
        struct l2cap_conn_rsp rsp;
-       struct sock *parent, *uninitialized_var(sk);
+       struct sock *parent, *sk = NULL;
        int result, status = L2CAP_CS_NO_INFO;
 
        u16 dcid = 0, scid = __le16_to_cpu(req->scid);
@@ -3000,7 +3000,7 @@ sendresp:
                                        L2CAP_INFO_REQ, sizeof(info), &info);
        }
 
-       if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) &&
+       if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) &&
                                result == L2CAP_CR_SUCCESS) {
                u8 buf[128];
                l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;