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

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Message-ID: <CAAM7YAk0csJLLVFF6KYA8vMG_BN6QDvmYvtnY0Sq7P=cBsuKfg@mail.gmail.com>
Date:	Sun, 4 Sep 2011 16:23:02 +0800
From:	"Yan, Zheng" <zheng.z.yan@...ux.intel.com>
To:	sedat.dilek@...il.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 3:12 PM, Sedat Dilek <sedat.dilek@...glemail.com> wrote:
> 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 ?

No

>
>> 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).
>

Thank you.

> - Sedat -
> --
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