netdev - Re: [RFC PATCH 3/3] usbnet: Fix memory leak when rx

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Message-ID: <877ewuoabu.fsf@miraculix.mork.no>
Date:   Tue, 19 Sep 2017 19:41:09 +0200
From:   Bjørn Mork <bjorn@...k.no>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Oliver Neukum <oneukum@...e.com>, groeck@...omium.org,
        grundler@...omium.org, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/3] usbnet: Fix memory leak when rx_submit() fails

Douglas Anderson <dianders@...omium.org> writes:

> If rx_submit() returns an error code then nobody calls usb_free_urb().
> That means it's leaked.

Nope.  rx_submit() will call usb_free_urb() before returning an error:


static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
..
	if (!skb) {
		netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
		usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
		usb_free_urb (urb);
		return -ENOMEM;
	}
..
	if (retval) {
		dev_kfree_skb_any (skb);
		usb_free_urb (urb);
	}





Bjørn