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:	Tue, 14 Oct 2014 21:46:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vasily Averin <vvs@...allels.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH v2] ipv4: dst_entry leak in ip_append_data()

On Tue, 2014-10-14 at 08:57 +0400, Vasily Averin wrote:
> v2: adjust the indentation of the arguments __ip_append_data() call
> 
> Fixes: 2e77d89b2fa8 ("net: avoid a pair of dst_hold()/dst_release() in ip_append_data()")
> 
> If sk_write_queue is empty ip_append_data() executes ip_setup_cork()
> that "steals" dst entry from rt to cork. Later it calls __ip_append_data()
> that creates skb and adds it to sk_write_queue.
> 
> If skb was added successfully following ip_push_pending_frames() call
> reassign dst entries from cork to skb, and kfree_skb frees dst_entry.
> 
> However nobody frees stolen dst_entry if skb was not added into sk_write_queue.

I thought this was done by ip_flush_pending_frames() ?

Can you describe the issue more precisely ?

Thanks !


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists