ISDN: Add check for usb_alloc_urb() result

usb_alloc_urb() return value needs to be checked to avoid
later NULL pointer access.
Reported by rucsoftsec@gmail.com via bugzilla.kernel.org #44601.

Signed-off-by: Karsten Keil <kkeil@linux-pingi.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 5 deletions

diff --git a/drivers/isdn/hisax/hfc_usb.c b/drivers/isdn/hisax/hfc_usb.c
index 84f9c8103078..849a80752685 100644
--- a/drivers/isdn/hisax/hfc_usb.c
+++ b/drivers/isdn/hisax/hfc_usb.c
@@ -1483,13 +1483,21 @@ hfc_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
                                 usb_rcvctrlpipe(context->dev, 0);
                         context->ctrl_out_pipe =
                                 usb_sndctrlpipe(context->dev, 0);
+
+                        driver_info = (hfcsusb_vdata *)
+                                      hfcusb_idtab[vend_idx].driver_info;
+
                         context->ctrl_urb = usb_alloc_urb(0, GFP_KERNEL);
 
-                        driver_info =
-                                (hfcsusb_vdata *) hfcusb_idtab[vend_idx].
-                                driver_info;
-                        printk(KERN_INFO "HFC-S USB: detected \"%s\"\n",
-                               driver_info->vend_name);
+                        if (!context->ctrl_urb) {
+                                pr_warn("%s: No memory for control urb\n",
+                                        driver_info->vend_name);
+                                kfree(context);
+                                return -ENOMEM;
+                        }
+
+                        pr_info("HFC-S USB: detected \"%s\"\n",
+                                driver_info->vend_name);
 
                         DBG(HFCUSB_DBG_INIT,
                             "HFC-S USB: Endpoint-Config: %s (if=%d alt=%d), E-Channel(%d)",