linux-kernel - Re: [PATCH] scsi: fcoe: add missed kfree() in an error path

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Date:   Thu, 9 Jul 2020 19:08:09 +0800
From:   Jing Xiangfeng <jingxiangfeng@...wei.com>
To:     Markus Elfring <Markus.Elfring@....de>,
        <linux-scsi@...r.kernel.org>
CC:     <kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Hannes Reinecke" <hare@...e.de>,
        "James E. J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Neerav Parikh <Neerav.Parikh@...el.com>
Subject: Re: [PATCH] scsi: fcoe: add missed kfree() in an error path



On 2020/7/9 15:22, Markus Elfring wrote:
>>>> fcoe_fdmi_info() misses to call kfree() in an error path.
>>>> Add the missed function call to fix it.
>>>
>>> I suggest to use an additional jump target for the completion
>>> of the desired exception handling.
>>>
>>>
>>> …
>>>> +++ b/drivers/scsi/fcoe/fcoe.c
>>>> @@ -830,6 +830,7 @@ static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev)
>>>>            if (rc) {
>>>>                printk(KERN_INFO "fcoe: Failed to retrieve FDMI "
>>>>                        "information from netdev.\n");
>>>> +            kfree(fdmi);
>>>>                return;
>>>>            }
>>>
>>> -            return;
>>> +            goto free_fdmi;
>>>
>>>
>>> How do you think about to apply any further coding style adjustments?
>>
>> The local variable "fdmi" is invisible to the function.
>
> I have got understanding difficulties for this information.
> The function call “kfree(fdmi)” is already used at the end of this if branch.
> Thus I propose to add a label there.
>
> Do you notice any additional improvement possibilities for this software module?

Indeed, Will change in the next version.
Thanks for your review
>
> Regards,
> Markus
> .
>