[PATCH 2/5] Staging: serqt_usb2: fix memory leak in error case

[Greg Kroah-Hartman]

From: Oliver Neukum <oliver at neukum.org>

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 at neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
---
 drivers/staging/serqt_usb2/serqt_usb2.c |    5 +++++
 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 f9ff9c2..0fdf8c6 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);
-- 
1.6.3.2