V4L/DVB (8895): pvrusb2: Fail gracefully if an alien USB ID is used

The driver includes an internal table specifying additional
information on a per device-type basis.  This works great until
somebody tries to run-time associate another USB ID with the driver.
This change should hopefully allow the driver to fail gracefully under
such a circumstance.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/pvrusb2/pvrusb2-hdw.c b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
index c8dedba..a7d636f 100644 (file)
--- a/drivers/media/video/pvrusb2/pvrusb2-hdw.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
@@ -1915,7 +1915,7 @@ struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf,
                                 const struct usb_device_id *devid)
 {
        unsigned int idx,cnt1,cnt2,m;
-       struct pvr2_hdw *hdw;
+       struct pvr2_hdw *hdw = NULL;
        int valid_std_mask;
        struct pvr2_ctrl *cptr;
        const struct pvr2_device_desc *hdw_desc;
@@ -1925,6 +1925,16 @@ struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf,
 
        hdw_desc = (const struct pvr2_device_desc *)(devid->driver_info);
 
+       if (hdw_desc == NULL) {
+               pvr2_trace(PVR2_TRACE_INIT, "pvr2_hdw_create:"
+                          " No device description pointer,"
+                          " unable to continue.");
+               pvr2_trace(PVR2_TRACE_INIT, "If you have a new device type,"
+                          " please contact Mike Isely <isely@pobox.com>"
+                          " to get it included in the driver\n");
+               goto fail;
+       }
+
        hdw = kzalloc(sizeof(*hdw),GFP_KERNEL);
        pvr2_trace(PVR2_TRACE_INIT,"pvr2_hdw_create: hdw=%p, type \"%s\"",
                   hdw,hdw_desc->description);