linux-kernel - Re: [PATCH 01/11] scsi: aacraid: Fix undefined behavior due to shift overflowing the constant

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Date:   Mon, 25 Apr 2022 11:47:11 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Borislav Petkov <bp@...en8.de>, LKML <linux-kernel@...r.kernel.org>
Cc:     Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH 01/11] scsi: aacraid: Fix undefined behavior due to shift
 overflowing the constant



On 4/5/22 08:15, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
> 
> Fix
> 
>   drivers/scsi/aacraid/commsup.c: In function ‘aac_handle_sa_aif’:
>   drivers/scsi/aacraid/commsup.c:1983:2: error: case label does not reduce to an integer constant
>     case SA_AIF_BPCFG_CHANGE:
>     ^~~~
> 
> See https://lore.kernel.org/r/YkwQ6%2BtIH8GQpuct@zn.tnic for the gory
> details as to why it triggers with older gccs only.
> 
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Cc: Adaptec OEM Raid Solutions <aacraid@...rosemi.com>
> Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
> Cc: linux-scsi@...r.kernel.org

Reviewed-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
>  drivers/scsi/aacraid/aacraid.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
> index f849e7c9d428..5e115e8b2ba4 100644
> --- a/drivers/scsi/aacraid/aacraid.h
> +++ b/drivers/scsi/aacraid/aacraid.h
> @@ -121,7 +121,7 @@ enum {
>  #define SA_AIF_PDEV_CHANGE		(1<<4)
>  #define SA_AIF_LDEV_CHANGE		(1<<5)
>  #define SA_AIF_BPSTAT_CHANGE		(1<<30)
> -#define SA_AIF_BPCFG_CHANGE		(1<<31)
> +#define SA_AIF_BPCFG_CHANGE		(1U<<31)
>  
>  #define HBA_MAX_SG_EMBEDDED		28
>  #define HBA_MAX_SG_SEPARATE		90

-- 
~Randy