USB: fix double kfree in ipaq in error case

in the error case the ipaq driver leaves a dangling pointer to already
freed memory that will be freed again.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/ipaq.c b/drivers/usb/serial/ipaq.c
index d9fb376..80d9ec5 100644 (file)
--- a/drivers/usb/serial/ipaq.c
+++ b/drivers/usb/serial/ipaq.c
@@ -646,12 +646,13 @@ static int ipaq_open(struct usb_serial_port *port, struct file *filp)
         */
 
        kfree(port->bulk_in_buffer);
-       kfree(port->bulk_out_buffer);
        port->bulk_in_buffer = kmalloc(URBDATA_SIZE, GFP_KERNEL);
        if (port->bulk_in_buffer == NULL) {
                port->bulk_out_buffer = NULL; /* prevent double free */
                goto enomem;
        }
+
+       kfree(port->bulk_out_buffer);
        port->bulk_out_buffer = kmalloc(URBDATA_SIZE, GFP_KERNEL);
        if (port->bulk_out_buffer == NULL) {
                kfree(port->bulk_in_buffer);