linux-kernel - Re: [PATCH] bnx2fc: shift wrapping bug in bnx2fc_process_unsol

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Message-ID: <200414664.924328.1480352735685.JavaMail.zimbra@redhat.com>
Date:   Mon, 28 Nov 2016 12:05:35 -0500 (EST)
From:   Laurence Oberman <loberman@...hat.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     QLogic-Storage-Upstream@...gic.com, jejb@...ux.vnet.ibm.com,
        martin petersen <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] bnx2fc: shift wrapping bug in
 bnx2fc_process_unsol_compl()



----- Original Message -----
> From: "Christophe JAILLET" <christophe.jaillet@...adoo.fr>
> To: QLogic-Storage-Upstream@...gic.com, jejb@...ux.vnet.ibm.com, "martin petersen" <martin.petersen@...cle.com>
> Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org, "Christophe JAILLET"
> <christophe.jaillet@...adoo.fr>
> Sent: Saturday, November 26, 2016 1:36:29 PM
> Subject: [PATCH] bnx2fc: shift wrapping bug in bnx2fc_process_unsol_compl()
> 
> BNX2FC_NUM_ERR_BITS is 63. err_warn_bit_map is a u64. So, to make sure that
> no shift wrapping will occur, we need need additionnal casting.
> 
> The same test is already done a few lines above and '(u64)1' is already
> used there. So just do the same here.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> I guess that this could also be written with a '1ULL << i' which would be
> cleaner and less verbose IMHO, but apparently this driver does not use
> such things yet. So keep the current style with casting.
> ---
>  drivers/scsi/bnx2fc/bnx2fc_hwi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/bnx2fc/bnx2fc_hwi.c
> b/drivers/scsi/bnx2fc/bnx2fc_hwi.c
> index 5ff9f89c17c7..a9dccb3b49cc 100644
> --- a/drivers/scsi/bnx2fc/bnx2fc_hwi.c
> +++ b/drivers/scsi/bnx2fc/bnx2fc_hwi.c
> @@ -829,7 +829,7 @@ static void bnx2fc_process_unsol_compl(struct
> bnx2fc_rport *tgt, u16 wqe)
>  			((u64)err_entry->data.err_warn_bitmap_hi << 32) |
>  			(u64)err_entry->data.err_warn_bitmap_lo;
>  		for (i = 0; i < BNX2FC_NUM_ERR_BITS; i++) {
> -			if (err_warn_bit_map & (u64) (1 << i)) {
> +			if (err_warn_bit_map & (u64)((u64)1 << i)) {
>  				err_warn = i;
>  				break;
>  			}
> --
> 2.9.3
> 
> --
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> 

Looks fine to me.
Reviewed-by: Laurence Oberman <loberman@...hat.com>