linux-kernel - Re: [PATCH] scsi: bnx2fc: fix incorrect cast to u64 on shift operation

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Date:   Wed, 8 May 2019 11:35:55 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Colin King <colin.king@...onical.com>,
        QLogic-Storage-Upstream@...gic.com,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: bnx2fc: fix incorrect cast to u64 on shift
 operation

Le 04/05/2019 à 18:48, Colin King a écrit :
> From: Colin Ian King <colin.king@...onical.com>
>
> Currently an int is being shifted and the result is being cast to a u64
> which leads to undefined behaviour if the shift is more than 31 bits. Fix
> this by casting the integer value 1 to u64 before the shift operation.
>
> Addresses-Coverity: ("Bad shift operation")
> Fixes: 7b594769120b ("[SCSI] bnx2fc: Handle REC_TOV error code from firmware")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>   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 19734ec7f42e..747f019fb393 100644
> --- a/drivers/scsi/bnx2fc/bnx2fc_hwi.c
> +++ b/drivers/scsi/bnx2fc/bnx2fc_hwi.c
> @@ -830,7 +830,7 @@ 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)1 << i)) {
>   				err_warn = i;
>   				break;
>   			}


Hi, just for the records and if you need additional ack, see

    https://lkml.org/lkml/2016/11/26/172

just my 2c :-)

CJ