linux-kernel - Re: [PATCH] aoe: fix the potential use-after-free problem in more places

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Message-ID: <20240513115605.GE4433@linux-l9pv.suse>
Date: Mon, 13 May 2024 19:56:05 +0800
From: joeyli <jlee@...e.com>
To: Markus Elfring <Markus.Elfring@....de>
Cc: linux-block@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Justin Sanders <justin@...aid.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Chun-Yi Lee <joeyli.kernel@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jens Axboe <axboe@...nel.dk>, Kirill Korotaev <dev@...nvz.org>,
	Nicolai Stange <nstange@...e.com>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [PATCH] aoe: fix the potential use-after-free problem in more
 places

Hi Markus,

Thanks for your review! I will send v2 patch.

Joey Lee

On Tue, Apr 30, 2024 at 06:16:00PM +0200, Markus Elfring wrote:
> > For fixing CVE-2023-6270, f98364e92662 patch moved dev_put() from
> …
> 
> Please add a subject for the mentioned commit hash.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.9-rc6#n99
> 
> 
> > This patch adds dev_hold() to those functions and also uses dev_put()
> > when the skb_clone() returns NULL.
> 
> Please improve this change description with a corresponding imperative wording.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.9-rc6#n94
> 
> 
> …
> > Fixes: f98364e92662 ("aoe: fix the potential use-after-free problem in
> > aoecmd_cfg_pkts")
> 
> I suggest to omit a line break for this tag.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.9-rc6#n145
> 
> 
> …
> > +++ b/drivers/block/aoe/aoecmd.c
> …
> > @@ -401,7 +402,8 @@ aoecmd_ata_rw(struct aoedev *d)
> >  		__skb_queue_head_init(&queue);
> >  		__skb_queue_tail(&queue, skb);
> >  		aoenet_xmit(&queue);
> > -	}
> > +	} else
> > +		dev_put(f->t->ifp->nd);
> >  	return 1;
> >  }
> >
> …
> > @@ -617,7 +622,8 @@ probe(struct aoetgt *t)
> >  		__skb_queue_head_init(&queue);
> >  		__skb_queue_tail(&queue, skb);
> >  		aoenet_xmit(&queue);
> > -	}
> > +	} else
> > +		dev_put(f->t->ifp->nd);
> >  }
> >
> >  static long
> …
> 
> Should curly brackets be used for both if branches in these function implementations?
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst?h=v6.9-rc6#n213
> 
> Regards,
> Markus