[PATCH 4.2.y-ckt 079/206] USB: serial: io_edgeport: fix memory leaks in probe error path

[Kamal Mostafa]

4.2.8-ckt12 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Johan Hovold <johan at kernel.org>

commit c8d62957d450cc1a22ce3242908709fe367ddc8e upstream.

URBs and buffers allocated in attach for Epic devices would never be
deallocated in case of a later probe error (e.g. failure to allocate
minor numbers) as disconnect is then never called.

Fix by moving deallocation to release and making sure that the
URBs are first unlinked.

Fixes: f9c99bb8b3a1 ("USB: usb-serial: replace shutdown with disconnect,
release")
Signed-off-by: Johan Hovold <johan at kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/usb/serial/io_edgeport.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index 1106e7d..1947ea0 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -2966,16 +2966,9 @@ static void edge_disconnect(struct usb_serial *serial)
 {
 	struct edgeport_serial *edge_serial = usb_get_serial_data(serial);
 
-	/* stop reads and writes on all ports */
-	/* free up our endpoint stuff */
 	if (edge_serial->is_epic) {
 		usb_kill_urb(edge_serial->interrupt_read_urb);
-		usb_free_urb(edge_serial->interrupt_read_urb);
-		kfree(edge_serial->interrupt_in_buffer);
-
 		usb_kill_urb(edge_serial->read_urb);
-		usb_free_urb(edge_serial->read_urb);
-		kfree(edge_serial->bulk_in_buffer);
 	}
 }
 
@@ -2988,6 +2981,16 @@ static void edge_release(struct usb_serial *serial)
 {
 	struct edgeport_serial *edge_serial = usb_get_serial_data(serial);
 
+	if (edge_serial->is_epic) {
+		usb_kill_urb(edge_serial->interrupt_read_urb);
+		usb_free_urb(edge_serial->interrupt_read_urb);
+		kfree(edge_serial->interrupt_in_buffer);
+
+		usb_kill_urb(edge_serial->read_urb);
+		usb_free_urb(edge_serial->read_urb);
+		kfree(edge_serial->bulk_in_buffer);
+	}
+
 	kfree(edge_serial);
 }
 
-- 
2.7.4