From: Dan Carpenter <dan.carpenter@oracle.com>
To: Pavel Skripkin <paskripkin@gmail.com>
Cc: Yanfei Xu <yanfei.xu@windriver.com>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
andrew@lunn.ch, hkallweit1@gmail.com, linux@armlinux.org.uk,
davem@davemloft.net, kuba@kernel.org, p.zabel@pengutronix.de,
syzbot+398e7dc692ddbbb4cfec@syzkaller.appspotmail.com,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
Dongliang Mu <mudongliangabcd@gmail.com>
Subject: Re: [PATCH] net: mdiobus: Fix memory leak in __mdiobus_register
Date: Tue, 28 Sep 2021 14:30:55 +0300 [thread overview]
Message-ID: <20210928113055.GN2083@kadam> (raw)
In-Reply-To: <f587da4b-09dd-4c32-4ee4-5ec8b9ad792f@gmail.com>
On Tue, Sep 28, 2021 at 02:09:06PM +0300, Pavel Skripkin wrote:
> On 9/28/21 14:06, Pavel Skripkin wrote:
> > > It's not actually the same. The state has to be set before the
> > > device_register() or there is still a leak.
> > >
> > Ah, I see... I forgot to handle possible device_register() error. Will
> > send v2 soon, thank you
> >
> >
> >
> Wait... Yanfei's patch is already applied to net tree and if I understand
> correctly, calling put_device() 2 times will cause UAF or smth else.
>
Yes. It causes a UAF.
Huh... You're right that the log should say "failed to register". But
I don't think that's the correct syzbot link for your patch either
because I don't think anyone calls mdiobus_free() if
__devm_mdiobus_register() fails. I have looked at these callers. It
would be a bug as well.
Anyway, your patch is required and the __devm_mdiobus_register()
function has leaks as well. And perhaps there are more bugs we have not
discovered.
regards,
dan carpenter
next prev parent reply other threads:[~2021-09-28 11:31 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-26 4:53 [PATCH] net: mdiobus: Fix memory leak in __mdiobus_register Yanfei Xu
2021-09-26 15:34 ` Andrew Lunn
2021-09-27 12:30 ` patchwork-bot+netdevbpf
2021-09-28 8:55 ` Dan Carpenter
2021-09-28 9:26 ` Dan Carpenter
2021-09-28 9:45 ` Pavel Skripkin
2021-09-28 10:39 ` Dan Carpenter
2021-09-28 10:46 ` Pavel Skripkin
2021-09-28 10:55 ` Dan Carpenter
2021-09-28 11:04 ` Pavel Skripkin
2021-09-28 10:59 ` Dan Carpenter
2021-09-28 11:06 ` Pavel Skripkin
2021-09-28 11:09 ` Pavel Skripkin
2021-09-28 11:30 ` Dan Carpenter [this message]
2021-09-28 11:45 ` Pavel Skripkin
2021-09-28 12:23 ` Dan Carpenter
2021-09-28 12:58 ` Russell King (Oracle)
2021-09-28 13:52 ` Dan Carpenter
2021-09-28 15:41 ` Russell King (Oracle)
2021-09-28 15:48 ` Dongliang Mu
2021-09-29 2:05 ` Xu, Yanfei
2021-09-28 13:11 ` Russell King (Oracle)
2021-09-29 21:31 ` Denis Efremov
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