netdev - Re: [PATCH net] net: llc: fix use after free in llc_ui

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Date:	Thu, 02 Jan 2014 19:31:55 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	dborkman@...hat.com
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	acme@...stprotocols.net
Subject: Re: [PATCH net] net: llc: fix use after free in llc_ui_recvmsg

From: Daniel Borkmann <dborkman@...hat.com>
Date: Mon, 30 Dec 2013 23:40:50 +0100

> While commit 30a584d944fb fixes datagram interface in LLC, a use
> after free bug has been introduced for SOCK_STREAM sockets that do
> not make use of MSG_PEEK.
> 
> The flow is as follow ...
> 
>   if (!(flags & MSG_PEEK)) {
>     ...
>     sk_eat_skb(sk, skb, false);
>     ...
>   }
>   ...
>   if (used + offset < skb->len)
>     continue;
> 
> ... where sk_eat_skb() calls __kfree_skb(). Therefore, cache
> original length and work on skb_len to check partial reads.
> 
> Fixes: 30a584d944fb ("[LLX]: SOCK_DGRAM interface fixes")
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>

Applied and queued up for -stable, thanks!
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