Bluetooth: hci_conn: Refactor hci_bind_bis() since it always succeeds

The compiler thinks "conn" might be NULL after a call to hci_bind_bis(),
which cannot happen. Avoid any confusion by just making it not return a
value since it cannot fail. Fixes the warnings seen with GCC 13:

In function 'arch_atomic_dec_and_test',
    inlined from 'atomic_dec_and_test' at ../include/linux/atomic/atomic-instrumented.h:576:9,
    inlined from 'hci_conn_drop' at ../include/net/bluetooth/hci_core.h:1391:6,
    inlined from 'hci_connect_bis' at ../net/bluetooth/hci_conn.c:2124:3:
../arch/x86/include/asm/rmwcc.h:37:9: warning: array subscript 0 is outside array bounds of 'atomic_t[0]' [-Warray-bounds=]
   37 |         asm volatile (fullop CC_SET(cc) \
      |         ^~~
...
In function 'hci_connect_bis':
cc1: note: source object is likely at address zero

Fixes: eca0ae4aea66 ("Bluetooth: Add initial implementation of BIS connections")
Cc: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: linux-bluetooth@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index acf563f..61a3480 100644 (file)
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -1981,16 +1981,14 @@ static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
                qos->latency = conn->le_conn_latency;
 }
 
-static struct hci_conn *hci_bind_bis(struct hci_conn *conn,
-                                    struct bt_iso_qos *qos)
+static void hci_bind_bis(struct hci_conn *conn,
+                        struct bt_iso_qos *qos)
 {
        /* Update LINK PHYs according to QoS preference */
        conn->le_tx_phy = qos->out.phy;
        conn->le_tx_phy = qos->out.phy;
        conn->iso_qos = *qos;
        conn->state = BT_BOUND;
-
-       return conn;
 }
 
 static int create_big_sync(struct hci_dev *hdev, void *data)
@@ -2119,11 +2117,7 @@ struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
        if (IS_ERR(conn))
                return conn;
 
-       conn = hci_bind_bis(conn, qos);
-       if (!conn) {
-               hci_conn_drop(conn);
-               return ERR_PTR(-ENOMEM);
-       }
+       hci_bind_bis(conn, qos);
 
        /* Add Basic Announcement into Peridic Adv Data if BASE is set */
        if (base_len && base) {