netdev - Re: [PATCH] libceph: fix use after free

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Date:   Tue, 27 Nov 2018 17:09:52 +0800
From:   PanBian <bianpan2016@....com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:     Ilya Dryomov <idryomov@...il.com>, "Yan, Zheng" <zyan@...hat.com>,
        Sage Weil <sage@...hat.com>, DavidS.Miller@bp,
        ceph-devel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libceph: fix use after free

On Tue, Nov 27, 2018 at 11:47:56AM +0300, Sergei Shtylyov wrote:
> Hello!
> 
> On 27.11.2018 10:02, Pan Bian wrote:
> 
> >The function ceph_monc_handle_map calls kfree(old) to free the old
> >monitor map, old points to monc->monmap. However, after that, it reads
> >monc->monmap->epoch and passes it to __ceph_monc_got_map. This result in
> >a use-after-free bug. The patch moves the free operation after the call
> >to __ceph_monc_got_map.
> >
> >Fixes: 82dcabad750("libceph: revamp subs code, switch to SUBSCRIBE2
> 
>    Space needed before (.
> 
> >protocol")
> 
>    Never break up the commit summary in this tag.

Thanks for the guidance, I will correct it.

> 
> >Signed-off-by: Pan Bian <bianpan2016@....com>
> [...]
> 
> MBR, Sergei