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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Luiz Augusto von Dentz <luiz.von.dentz@intel.com>,
        Marcel Holtmann <marcel@holtmann.org>,
        Zubin Mithra <zsm@chromium.org>
Subject: [PATCH 5.4 71/71] Bluetooth: L2CAP: Fix handling LE modes by L2CAP_OPTIONS
Date:   Mon, 24 May 2021 17:26:17 +0200
Message-Id: <20210524152328.751081397@linuxfoundation.org>
In-Reply-To: <20210524152326.447759938@linuxfoundation.org>
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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;