lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Thu, 03 May 2007 16:34:28 +0200
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Keir Fraser <Keir.Fraser@...cam.ac.uk>
Subject: Re: netfront for review

Jeremy Fitzhardinge wrote:
> Gerd Hoffmann wrote:
>>> Gerd, in change 11196:b85da7cd9ea5 "front: Fix rx buffer leak when
>>> tearing down an interface." you added a call to
>>> "add_id_to_freelist(np->rx_skbs, id);".  However, rx_skbs doesn't have
>>> an extra entry for the list head, and there's never any corresponding
>>> get_id_from_freelist(np->rx_skbs).  What should it be?
>> The function has an effect in page flipping mode only.  It walks the
>> whole list of rx skbufs (id is the loop variable ...), checks whenever
>> they are handed out to the frontend driver to fill in packet data and
>> not returned yet, and if so reclaim them ...
> 
> Yes, but why use add_id_to_freelist?  rx_skbs are not being used on a
> freelist anywhere else.  It just means the rx_skb array gets filled with
> small integers, but the rest of the code assumes they're either NULL or
> an skb pointer.

Hmm, good point.  Have to look at the code again, it has been some time 
I've written that, and it took me some time to figure how all the grant 
table stuff works ...

Maybe the add_id_to_freelist() call can simply be dropped.  The whole 
interface is released shortly thereafter, probably thats why filling the 
freelist with yunk never caused any problems ...

cheers,
   Gerd

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists