linux-kernel - Re: [PATCH v7 07/15] scsi: fnic: Add and integrate support for FDMI

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Message-ID: <d18ed046-0d16-49d6-b666-8ef8ee20f6d2@redhat.com>
Date: Mon, 13 Jan 2025 12:35:03 -0500
From: John Meneghini <jmeneghi@...hat.com>
To: Dan Carpenter <dan.carpenter@...aro.org>,
 Karan Tilak Kumar <kartilak@...co.com>
Cc: sebaddel@...co.com, arulponn@...co.com, djhawar@...co.com,
 gcboffa@...co.com, mkai2@...co.com, satishkh@...co.com, aeasi@...co.com,
 jejb@...ux.ibm.com, martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v7 07/15] scsi: fnic: Add and integrate support for FDMI

Just a note to say that these patches are important to Red Hat and we are actively engaged in back porting and testing these patches in to RHEL-9 and RHEL-10.

I think these issues that Dan has pointed out are all issues which can be addressed in a follow up patch.

/John

On 1/7/25 07:30, Dan Carpenter wrote:
> On Wed, Dec 11, 2024 at 06:03:04PM -0800, Karan Tilak Kumar wrote:
>> @@ -612,6 +615,7 @@ static int fnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>>   	unsigned long flags;
>>   	int hwq;
>>   	char *desc, *subsys_desc;
>> +	int len;
> 
> Do not introduce unnecessary levels of indirection.  Get rid of this len
> variable.
> 
>>   
>>   	/*
>>   	 * Allocate SCSI Host and set up association between host,
>> @@ -646,9 +650,17 @@ static int fnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>>   	fnic_stats_debugfs_init(fnic);
>>   
>>   	/* Find model name from PCIe subsys ID */
>> -	if (fnic_get_desc_by_devid(pdev, &desc, &subsys_desc) == 0)
>> +	if (fnic_get_desc_by_devid(pdev, &desc, &subsys_desc) == 0) {
>>   		dev_info(&fnic->pdev->dev, "Model: %s\n", subsys_desc);
>> -	else {
>> +
>> +		/* Update FDMI model */
> 
> This comment adds no information.  Delete it.
> 
>> +		fnic->subsys_desc_len = strlen(subsys_desc);
> 
> Keep in mind that strlen() does not count the NUL-terminator.
> 
>> +		len = ARRAY_SIZE(fnic->subsys_desc);
> 
> Use sizeof() when you are talking about bytes or chars.  For snprintf() and
> other string functions, it's always sizeof() and never ARRAY_SIZE().
> 
>> +		if (fnic->subsys_desc_len > len)
>> +			fnic->subsys_desc_len = len;
>> +		memcpy(fnic->subsys_desc, subsys_desc, fnic->subsys_desc_len);
> 
> So this is an 0-14 character buffer.  If fnic->subsys_desc_len is set to 14,
> then the string is not NUL terminated.  This is how the buffer is used in
> fdls_fdmi_register_hba()
> 
> 	strscpy_pad(data, fnic->subsys_desc, FNIC_FDMI_MODEL_LEN);
> 	data[FNIC_FDMI_MODEL_LEN - 1] = 0;
> 
> This suggests that fnic->subsys_desc is expected to be NUL-terminated.
> However FNIC_FDMI_MODEL_LEN is 12.  So in that case the last 3 characters
> are removed.  LOL.  It's harmless but so very annoying.
> 
> Also strscpy_pad() will ensure that data[FNIC_FDMI_MODEL_LEN - 1] is set
> to zero so that line could be deleted.
> 
> regards,
> dan carpenter
>