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Subject: Re: [PATCH] scsi: fcoe: add missed kfree() in an error path
To:     Jing Xiangfeng <jingxiangfeng@huawei.com>,
        linux-scsi@vger.kernel.org
Cc:     kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org,
        Hannes Reinecke <hare@suse.de>,
        "James E. J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Neerav Parikh <Neerav.Parikh@intel.com>
References: <977e2781-99ed-54c0-27ad-82d768a1c1e6@web.de>
 <5F067CDA.8010404@huawei.com>
From:   Markus Elfring <Markus.Elfring@web.de>
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Date:   Thu, 9 Jul 2020 09:22:34 +0200
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>>> 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.
>>
>>
>> =E2=80=A6
>>> +++ b/drivers/scsi/fcoe/fcoe.c
>>> @@ -830,6 +830,7 @@ static void fcoe_fdmi_info(struct fc_lport *lport,=
 struct net_device *netdev)
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (rc) {
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 printk(KERN_INFO "fcoe: Failed to retrieve FDMI "
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 "information fro=
m netdev.\n");
>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 kf=
ree(fdmi);
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 return;
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>>
>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ret=
urn;
>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 got=
o 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 =E2=80=9Ckfree(fdmi)=E2=80=9D 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 m=
odule?

Regards,
Markus