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>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/usb/serial/ipaq.c b/drivers/usb/serial/ipaq.c
index d9fb3768a2d7..80d9ec5570d6 100644
--- 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);