netdev - Re: linux-next: BUG: KASAN: use-after-free in tun_chr

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Date:   Wed, 16 May 2018 15:32:59 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Andrei Vagin <avagin@...tuozzo.com>, netdev@...r.kernel.org
Subject: Re: linux-next: BUG: KASAN: use-after-free in tun_chr_close



On 2018年05月16日 15:12, Andrei Vagin wrote:
> Hi Jason,
>
> I think the problem is in "tun: hold a tun socket during ptr_ring_cleanup".
>
> Pls take a look at the attached patch.

Yes.

It looks to me it's not necessary to take extra refcnt during release, 
we can just do the cleanup at __tun_detach().

Could you help to test the attached patch?

Thanks


View attachment "0001-tuntap-fix-use-after-free-during-release.patch" of type "text/x-patch" (1363 bytes)