USB: sierra: fix urb and memory leak in resume error path

commit 7fdd26a01eb7b6cb6855ff8f69ef4a720720dfcb upstream.

Neither the transfer buffer or the urb itself were released in the
resume error path for delayed writes. Also on errors, the remainder of
the queue was not even processed, which leads to further urb and buffer
leaks.

The same error path also failed to balance the outstanding-urb counter,
something which results in degraded throughput or completely blocked
writes.

Fix this by releasing urb and buffer and balancing counters on errors,
and by always processing the whole queue even when submission of one urb
fails.

Fixes: e6929a9020ac ("USB: support for autosuspend in sierra while
online")

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 8d3edaa..5e8484a 100644 (file)
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -1065,8 +1065,12 @@ static int sierra_resume(struct usb_serial *serial)
                        if (err < 0) {
                                intfdata->in_flight--;
                                usb_unanchor_urb(urb);
-                               usb_scuttle_anchored_urbs(&portdata->delayed);
-                               break;
+                               kfree(urb->transfer_buffer);
+                               usb_free_urb(urb);
+                               spin_lock(&portdata->lock);
+                               portdata->outstanding_urbs--;
+                               spin_unlock(&portdata->lock);
+                               continue;
                        }
                }