Staging: serqt_usb2: fix memory leak in error case

a standard memory leak, as later allocations may fail even if prior
allocations did not. Then the prior allocations must be undone.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/staging/serqt_usb2/serqt_usb2.c b/drivers/staging/serqt_usb2/serqt_usb2.c
index f9ff9c26678..0fdf8c6dc64 100644
--- a/drivers/staging/serqt_usb2/serqt_usb2.c
+++ b/drivers/staging/serqt_usb2/serqt_usb2.c
@@ -738,6 +738,11 @@ static int qt_startup(struct usb_serial *serial)
                 if (!qt_port) {
                         dbg("%s: kmalloc for quatech_port (%d) failed!.",
                             __func__, i);
+                        for(--i; i >= 0; i--) {
+                                port = serial->port[i];
+                                kfree(usb_get_serial_port_data(port));
+                                usb_set_serial_port_data(port, NULL);
+                        }
                         return -ENOMEM;
                 }
                 spin_lock_init(&qt_port->lock);