linux-kernel - Re: [PATCH v2 02/29] include: scsi: scsi_transport_fc: Match HBA Attribute Length with HBAAPI V2.0 definitions

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Message-ID: <52269484-8df0-38f7-2be3-b0a10ff9696d@suse.de>
Date:   Tue, 14 Jul 2020 08:49:05 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Lee Jones <lee.jones@...aro.org>, jejb@...ux.ibm.com,
        martin.petersen@...cle.com
Cc:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH v2 02/29] include: scsi: scsi_transport_fc: Match HBA
 Attribute Length with HBAAPI V2.0 definitions

On 7/13/20 9:46 AM, Lee Jones wrote:
> According to 'include/scsi/scsi_transport_fc.h':
> 
>   "Attributes are based on HBAAPI V2.0 definitions"
> 
> ... so it seems sane to match the 'HBA Attribute Length' to them.
> 
> If we don't, the compiler complains that the copied data will be truncated.
> 
> Fixes the following W=1 kernel build warning(s):
> 
>   In file included from include/linux/bitmap.h:9,
>   from include/linux/cpumask.h:12,
>   from include/linux/smp.h:13,
>   from include/linux/percpu.h:7,
>   from include/scsi/libfc.h:13,
>   from drivers/scsi/libfc/fc_elsct.c:17:
>   In function ‘strncpy’,
>   inlined from ‘fc_ct_ms_fill.constprop’ at include/scsi/fc_encode.h:263:3:
>   include/linux/string.h:297:30: warning: ‘__builtin_strncpy’ output may be truncated copying 64 bytes from a string of length  79 [-Wstringop-truncation]
>   297 | #define __underlying_strncpy __builtin_strncpy
>   | ^
>   include/linux/string.h:307:9: note: in expansion of macro ‘__underlying_strncpy’
>   307 | return __underlying_strncpy(p, q, size);
>   | ^~~~~~~~~~~~~~~~~~~~
>   In function ‘strncpy’,
>   inlined from ‘fc_ct_ms_fill.constprop’ at include/scsi/fc_encode.h:275:3:
>   include/linux/string.h:297:30: warning: ‘__builtin_strncpy’ output may be truncated copying 64 bytes from a string of length 79 [-Wstringop-truncation]
>   297 | #define __underlying_strncpy __builtin_strncpy
>   | ^
>   include/linux/string.h:307:9: note: in expansion of macro ‘__underlying_strncpy’
>   307 | return __underlying_strncpy(p, q, size);
>   | ^~~~~~~~~~~~~~~~~~~~
> 
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>   include/scsi/fc/fc_ms.h | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/scsi/fc/fc_ms.h b/include/scsi/fc/fc_ms.h
> index 800d53dc94705..9e273fed0a85f 100644
> --- a/include/scsi/fc/fc_ms.h
> +++ b/include/scsi/fc/fc_ms.h
> @@ -63,8 +63,8 @@ enum fc_fdmi_hba_attr_type {
>    * HBA Attribute Length
>    */
>   #define FC_FDMI_HBA_ATTR_NODENAME_LEN		8
> -#define FC_FDMI_HBA_ATTR_MANUFACTURER_LEN	64
> -#define FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN	64
> +#define FC_FDMI_HBA_ATTR_MANUFACTURER_LEN	80
> +#define FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN	80
>   #define FC_FDMI_HBA_ATTR_MODEL_LEN		256
>   #define FC_FDMI_HBA_ATTR_MODELDESCR_LEN		256
>   #define FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN	256
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke            Teamlead Storage & Networking
hare@...e.de                               +49 911 74053 688
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