netdev - Re: [PATCH] net: mdiobus: Fix memory leak in __mdiobus

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Date:   Tue, 28 Sep 2021 14:04:48 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Yanfei Xu <yanfei.xu@...driver.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, kuba@...nel.org, p.zabel@...gutronix.de,
        syzbot+398e7dc692ddbbb4cfec@...kaller.appspotmail.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Dongliang Mu <mudongliangabcd@...il.com>
Subject: Re: [PATCH] net: mdiobus: Fix memory leak in __mdiobus_register

On 9/28/21 13:55, Dan Carpenter wrote:
> On Tue, Sep 28, 2021 at 01:46:56PM +0300, Pavel Skripkin wrote:
>> On 9/28/21 13:39, Dan Carpenter wrote:
>> > No, the syzbot link was correct.
>> > 
>> 
>> Link is correct, but Yanfei's patch does not fix this bug. Syzbot reported
>> leak, that you described below, not the Yanfei one.
>> 
> 
> I promise you that Yanfei's link was correct.  That bug was in
> __devm_mdiobus_register().  It's a totally separate issue.
> 

I must be missing something, or we are talking about different links :)

Let me explain why I think, that Yanfei's patch cannot fix leak reported 
by syzkaller [1] (I hope, we are talking about this link)


Yanfei has changed this code part:

	err = device_register(&bus->dev);
	if (err) {
(*)		pr_err("mii_bus %s failed to register\n", bus->id);
		return -EINVAL;
	}

So, if executing gets into this branch we should see error message (*), 
right? There is no such message into log file on bug report page [1], so 
how is it possible?




[1] 
https://syzkaller.appspot.com/bug?id=fa99459691911a0369622248e0f4e3285fcedd97
	

With regards,
Pavel Skripkin