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

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Message-ID: <11361de9-b145-41c0-8d5e-5312cd710124@web.de>
Date: Tue, 30 Apr 2024 18:16:00 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Chun-Yi Lee <jlee@...e.com>, linux-block@...r.kernel.org,
 kernel-janitors@...r.kernel.org, Justin Sanders <justin@...aid.com>
Cc: 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

> 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