Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Message-ID: <f587da4b-09dd-4c32-4ee4-5ec8b9ad792f@gmail.com>
Date:   Tue, 28 Sep 2021 14:09:06 +0300
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
 Thunderbird/91.1.0
Subject: Re: [PATCH] net: mdiobus: Fix memory leak in __mdiobus_register
Content-Language: en-US
From:   Pavel Skripkin <paskripkin@gmail.com>
To:     Dan Carpenter <dan.carpenter@oracle.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>
References: <20210926045313.2267655-1-yanfei.xu@windriver.com>
 <20210928085549.GA6559@kili> <20210928092657.GI2048@kadam>
 <6f90fa0f-6d3b-0ca7-e894-eb971b3b69fa@gmail.com>
 <20210928103908.GJ2048@kadam>
 <63b18426-c39e-d898-08fb-8bfd05b7be9e@gmail.com>
 <20210928105943.GL2083@kadam>
 <283d01f0-d5eb-914e-1bd2-baae0420073c@gmail.com>
In-Reply-To: <283d01f0-d5eb-914e-1bd2-baae0420073c@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk

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.


With regards,
Pavel Skripkin