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Date: Mon, 11 Sep 2023 07:59:04 +0200
From: Simon Horman <horms@kernel.org>
To: Jeremy Cline <jeremy@jcline.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
	"David S . Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	syzbot+c1d0a03d305972dbbe14@syzkaller.appspotmail.com
Subject: Re: [PATCH net] net: nfc: llcp: Add lock when modifying device list
Message-ID: <20230911055904.GN775887@kernel.org>
References: <20230908235853.1319596-1-jeremy@jcline.org>
 <20230910152812.GJ775887@kernel.org>
 <ZP5L6/zF6fE+ogbz@dev>
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In-Reply-To: <ZP5L6/zF6fE+ogbz@dev>

On Sun, Sep 10, 2023 at 07:06:19PM -0400, Jeremy Cline wrote:
> On Sun, Sep 10, 2023 at 05:28:12PM +0200, Simon Horman wrote:
> > On Fri, Sep 08, 2023 at 07:58:53PM -0400, Jeremy Cline wrote:
> > > The device list needs its associated lock held when modifying it, or the
> > > list could become corrupted, as syzbot discovered.
> > > 
> > > Reported-and-tested-by: syzbot+c1d0a03d305972dbbe14@syzkaller.appspotmail.com
> > > Closes: https://syzkaller.appspot.com/bug?extid=c1d0a03d305972dbbe14
> > > Signed-off-by: Jeremy Cline <jeremy@jcline.org>
> > 
> > Hi Jeremy,
> > 
> > thanks for your patch.
> > 
> > I don't think you need to resubmit for this,
> > I think this patch warrants a fixes tag:
> > 
> > Fixes: d646960f7986 ("NFC: Initial LLCP support")
> > 
> 
> My bad, indeed. The lock in question looks to have been added in
> 6709d4b7bc2e ("net: nfc: Fix use-after-free caused by
> nfc_llcp_find_local") which itself includes a couple fix tags, should
> this reference that commit instead as it won't backport without that
> one?

Yes, I think that is likely.
Sorry for not noticing that.

> > Otherwise, this looks good to me.
> > 
> > Reviewed-by: Simon Horman <horms@kernel.org>
> > 
> 
> Thanks,
> Jeremy
>