netdev - Re: [PATCH] ipw2200: fix memory leak in ipw_wdev

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Message-ID: <2faab482-33cd-fb07-f0cf-472566784825@huawei.com>
Date:   Fri, 9 Dec 2022 09:01:20 +0800
From:   shaozhengchao <shaozhengchao@...wei.com>
To:     Jiri Pirko <jiri@...nulli.us>
CC:     <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <stas.yakovlev@...il.com>, <kvalo@...nel.org>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <linville@...driver.com>,
        <weiyongjun1@...wei.com>, <yuehaibing@...wei.com>
Subject: Re: [PATCH] ipw2200: fix memory leak in ipw_wdev_init()



On 2022/12/8 21:00, Jiri Pirko wrote:
> Thu, Dec 08, 2022 at 01:26:30PM CET, shaozhengchao@...wei.com wrote:
>> In the error path of ipw_wdev_init(), exception value is returned, and
>> the memory applied for in the function is not released. Also the memory
>> is not released in ipw_pci_probe(). As a result, memory leakage occurs.
>> So memory release needs to be added to the error path of ipw_wdev_init().
>>
>> Fixes: a3caa99e6c68 ("libipw: initiate cfg80211 API conversion (v2)")
>> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
>> ---
>> drivers/net/wireless/intel/ipw2x00/ipw2200.c | 8 +++++++-
>> 1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/wireless/intel/ipw2x00/ipw2200.c b/drivers/net/wireless/intel/ipw2x00/ipw2200.c
>> index 5b483de18c81..cead5c7fc91e 100644
>> --- a/drivers/net/wireless/intel/ipw2x00/ipw2200.c
>> +++ b/drivers/net/wireless/intel/ipw2x00/ipw2200.c
>> @@ -11397,9 +11397,15 @@ static int ipw_wdev_init(struct net_device *dev)
>> 	set_wiphy_dev(wdev->wiphy, &priv->pci_dev->dev);
>>
>> 	/* With that information in place, we can now register the wiphy... */
>> -	if (wiphy_register(wdev->wiphy))
>> +	if (wiphy_register(wdev->wiphy)) {
> 
> While you are at it, how about to take the actual return value of
> wiphy_register() into account?
> 
> 
Hi Jiri:
	Thank you for your suggestion. I will change it in V2.

Zhengchao Shao
>> 		rc = -EIO;
>> +		goto out;
>> +	}
>> +
>> +	return 0;
>> out:
>> +	kfree(priv->ieee->a_band.channels);
>> +	kfree(priv->ieee->bg_band.channels);
>> 	return rc;
>> }
>>
>> -- 
>> 2.34.1
>>