linux-kernel - Re: [PATCH] scsi: aic79xx: add scb NULL check in ahd_handle_msg

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Date: Mon, 1 Apr 2024 16:10:41 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Aleksandr Aprelkov <aaprelkov@...rgate.com>,
 Hannes Reinecke <hare@...e.com>
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>,
 "Martin K. Petersen" <martin.petersen@...cle.com>,
 linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
 lvc-project@...uxtesting.org
Subject: Re: [PATCH] scsi: aic79xx: add scb NULL check in
 ahd_handle_msg_reject()

On 4/1/24 15:10, Aleksandr Aprelkov wrote:
> If ahd_lookup_scb() returns NULL and ahd_sent_msg() checks are false,
> then NULL pointer dereference happens
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Aleksandr Aprelkov <aaprelkov@...rgate.com>
> ---
>  drivers/scsi/aic7xxx/aic79xx_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/aic7xxx/aic79xx_core.c b/drivers/scsi/aic7xxx/aic79xx_core.c
> index 3e3100dbfda3..9e0fafa12e87 100644
> --- a/drivers/scsi/aic7xxx/aic79xx_core.c
> +++ b/drivers/scsi/aic7xxx/aic79xx_core.c
> @@ -5577,7 +5577,7 @@ ahd_handle_msg_reject(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
>  		       "Using asynchronous transfers\n",
>  		       ahd_name(ahd), devinfo->channel,
>  		       devinfo->target, devinfo->lun);
> -	} else if ((scb->hscb->control & SIMPLE_QUEUE_TAG) != 0) {
> +	} else if (scb && (scb->hscb->control & SIMPLE_QUEUE_TAG) != 0) {

"!= 0" is not needed.

>  		int tag_type;
>  		int mask;
>  

-- 
Damien Le Moal
Western Digital Research