linux-kernel - Re: [PATCH] scsi: lpfc_nvme: Fix wrong sizeof argument

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Date:   Mon, 18 Mar 2019 14:58:03 -0700
From:   James Smart <james.smart@...adcom.com>
To:     James Bottomley <jejb@...ux.ibm.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: lpfc_nvme: Fix wrong sizeof argument



On 3/18/2019 10:44 AM, James Bottomley wrote:
> On Mon, 2019-03-18 at 12:15 -0500, Gustavo A. R. Silva wrote:
>> sizeof() is currently using the wrong argument when used in a call to
>> memset().  Notice that wqe is a pointer to union lpfc_wqe128, not to
>> union lpfc_wqe.
>>
>> Fix this by using union lpfc_wqe128 instead of lpfc_wqe as argument
>> of sizeof().
>>
>> Addresses-Coverity-ID: 1443938 ("Wrong sizeof argument")
>> Fixes: 5fd1108517d9 ("scsi: lpfc: Streamline NVME Initiator WQE
>> setup")
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>> ---
>>   drivers/scsi/lpfc/lpfc_nvme.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/scsi/lpfc/lpfc_nvme.c
>> b/drivers/scsi/lpfc/lpfc_nvme.c
>> index d16ca413110d..3dc0c85c7d50 100644
>> --- a/drivers/scsi/lpfc/lpfc_nvme.c
>> +++ b/drivers/scsi/lpfc/lpfc_nvme.c
>> @@ -1981,7 +1981,7 @@ lpfc_get_nvme_buf(struct lpfc_hba *phba, struct
>> lpfc_nodelist *ndlp,
>>   		/* Fill in word 3 / sgl_len during cmd submission */
>>   
>>   		/* Initialize WQE */
>> -		memset(wqe, 0, sizeof(union lpfc_wqe));
>> +		memset(wqe, 0, sizeof(union lpfc_wqe128));
> Actually the correct way to avoid potential problems like this is
>
> 	memset(wqe, 0, sizeof(*wqe));
>
> James
>

Agree with James on style.   This one reference was a little 
interesting. It purposely was something smaller than the whole structure 
as the latter end of the structure ends up getting set later.  But not a 
big deal to correct as indicated.

--james