USB: serial: pl2303: fix NULL-deref at open
[pandora-kernel.git] / drivers / usb / serial / pl2303.c
index a440387..c23f716 100644 (file)
@@ -185,10 +185,18 @@ static int pl2303_vendor_write(__u16 value, __u16 index,
 static int pl2303_startup(struct usb_serial *serial)
 {
        struct pl2303_private *priv;
+       unsigned char num_ports = serial->num_ports;
        enum pl2303_type type = type_0;
        unsigned char *buf;
        int i;
 
+       if (serial->num_bulk_in < num_ports ||
+                       serial->num_bulk_out < num_ports ||
+                       serial->num_interrupt_in < num_ports) {
+               dev_err(&serial->interface->dev, "missing endpoints\n");
+               return -ENODEV;
+       }
+
        buf = kmalloc(10, GFP_KERNEL);
        if (buf == NULL)
                return -ENOMEM;