netdev - Re: [PATCH net] net: hns: fix possible memory leak in hnae_ae

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Message-ID: <20221020124307.7822e881@kernel.org>
Date:   Thu, 20 Oct 2022 12:43:07 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     Leon Romanovsky <leon@...nel.org>, <netdev@...r.kernel.org>,
        <yisen.zhuang@...wei.com>, <salil.mehta@...wei.com>,
        <davem@...emloft.net>
Subject: Re: [PATCH net] net: hns: fix possible memory leak in
 hnae_ae_register()

On Thu, 20 Oct 2022 15:48:38 +0800 Yang Yingliang wrote:
> On 2022/10/20 8:28, Jakub Kicinski wrote:
> > On Tue, 18 Oct 2022 15:58:38 +0300 Leon Romanovsky wrote:  
> >> The change itself is ok.  
> >
> > Also the .release function is empty which is another bad smell?  
>
> The upper device (struct dsaf_device *dsaf_dev) is allocated by 
> devm_kzalloc(), so it's no need to free it in ->release().

Nah ah. devm_* is just for objects which tie their lifetime naturally
to the lifetime of the driver instance, IOW the device ->priv.

struct device allocated by the driver is not tied to that, it's 
a properly referenced object. I don't think that just because 
the driver that allocated it got ->remove()d you're safe to free
allocated struct devices.