Bluetooth: Refuse ConfigRsp with different mode

If our mode is Basic Mode we have to refuse any ConfigRsp that proposes
a different mode.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index ca9bab225777..c5904082392c 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -2747,7 +2747,6 @@ static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data,
                                                         rfc.mode != pi->mode)
                                 return -ECONNREFUSED;
 
-                        pi->mode = rfc.mode;
                         pi->fcs = 0;
 
                         l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
@@ -2756,6 +2755,11 @@ static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data,
                 }
         }
 
+        if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode)
+                return -ECONNREFUSED;
+
+        pi->mode = rfc.mode;
+
         if (*result == L2CAP_CONF_SUCCESS) {
                 switch (rfc.mode) {
                 case L2CAP_MODE_ERTM: