Bluetooth: btusb: check for NULL in btusb_find_altsetting()

The new btusb_find_altsetting() dereferences it without checking
the check is added in this patch

Signed-off-by: Sathish Narasimman <sathish.narasimman@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 09913ca..8711627 100644 (file)
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1622,6 +1622,9 @@ static struct usb_host_interface *btusb_find_altsetting(struct btusb_data *data,
 
        BT_DBG("Looking for Alt no :%d", alt);
 
+       if (!intf)
+               return NULL;
+
        for (i = 0; i < intf->num_altsetting; i++) {
                if (intf->altsetting[i].desc.bAlternateSetting == alt)
                        return &intf->altsetting[i];