[PATCH 5.4 71/71] Bluetooth: L2CAP: Fix handling LE modes by L2CAP_OPTIONS

Greg Kroah-Hartman
2021-05-24T15:56:04Z

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

commit b86b0b150fed840c376145383ef5105116c81b0c upstream.

L2CAP_OPTIONS shall only be used with BR/EDR modes.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Zubin Mithra <zsm@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/bluetooth/l2cap_sock.c | 24 ++++++++++++++++++++----
1 file changed, 20 insertions(+), 4 deletions(-)

--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -426,6 +426,20 @@ static int l2cap_sock_getsockopt_old(str
break;
}

+ /* Only BR/EDR modes are supported here */
+ switch (chan->mode) {
+ case L2CAP_MODE_BASIC:
+ case L2CAP_MODE_ERTM:
+ case L2CAP_MODE_STREAMING:
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ if (err < 0)
+ break;
+
memset(&opts, 0, sizeof(opts));
opts.imtu = chan->imtu;
opts.omtu = chan->omtu;
@@ -685,10 +699,8 @@ static int l2cap_sock_setsockopt_old(str
break;
}

- chan->mode = opts.mode;
- switch (chan->mode) {
- case L2CAP_MODE_LE_FLOWCTL:
- break;
+ /* Only BR/EDR modes are supported here */
+ switch (opts.mode) {
case L2CAP_MODE_BASIC:
clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
break;
@@ -702,6 +714,10 @@ static int l2cap_sock_setsockopt_old(str
break;
}

+ if (err < 0)
+ break;
+
+ chan->mode = opts.mode;
chan->imtu = opts.imtu;
chan->omtu = opts.omtu;
chan->fcs = opts.fcs;