netdev - Re: [PATCH -next v2] unix stream: Fix use-after-free crashes

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Message-ID: <CA+icZUU25QMMCVT1VfF9XB0wrkppNmKQbHwoHDAQ-qV9bi+HqQ@mail.gmail.com>
Date:	Sun, 4 Sep 2011 09:12:21 +0200
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
	"tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>,
	"jirislaby@...il.com" <jirislaby@...il.com>
Subject: Re: [PATCH -next v2] unix stream: Fix use-after-free crashes

On Sun, Sep 4, 2011 at 7:44 AM, Yan, Zheng <zheng.z.yan@...el.com> wrote:
> Commit 0856a30409 (Scm: Remove unnecessary pid & credential references
> in Unix socket's send and receive path) introduced a use-after-free bug.
> It passes the scm reference to the first skb. Skb(s) afterwards may
> reference freed data structure because the first skb can be destructed
> by the receiver at anytime. The fix is by passing the scm reference to
> the very last skb.
>

s/by passing/bypassing ?

> Signed-off-by: Zheng Yan <zheng.z.yan@...el.com>
> Reported-by: Jiri Slaby <jirislaby@...il.com>
> ---

Tested on i386 against linux-next (next-20110831).

- Sedat -
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