V4L/DVB (12369): stv680: kfree called before usb_kill_urb

The irq handler will touch memory. Even in the error case some URBs may
complete. Thus no memory must be kfreed before all URBs are killed.
Signed-off-by: Oliver Neukum <oliver@neukum.org>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/stv680.c

@@ -734,10 +734,6 @@ static int stv680_start_stream (struct usb_stv *stv680)
 	return 0;
 
  nomem_err:
-	for (i = 0; i < STV680_NUMSCRATCH; i++) {
-		kfree(stv680->scratch[i].data);
-		stv680->scratch[i].data = NULL;
-	}
 	for (i = 0; i < STV680_NUMSBUF; i++) {
 		usb_kill_urb(stv680->urb[i]);
 		usb_free_urb(stv680->urb[i]);
@@ -745,6 +741,11 @@ static int stv680_start_stream (struct usb_stv *stv680)
 		kfree(stv680->sbuf[i].data);
 		stv680->sbuf[i].data = NULL;
 	}
+	/* used in irq, free only as all URBs are dead */
+	for (i = 0; i < STV680_NUMSCRATCH; i++) {
+		kfree(stv680->scratch[i].data);
+		stv680->scratch[i].data = NULL;
+	}
 	return -ENOMEM;
 
 }