linux-kernel - Re: [PATCH] scsi: initio: Add checks for errors in initio

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Message-ID: <409766b3-dcd4-6de8-a2f4-42391aa197b7@ispras.ru>
Date:   Mon, 3 Apr 2023 21:22:38 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org,
        Semyon Verchenko <semverchenko@...tor-ts.ru>
Subject: Re: [PATCH] scsi: initio: Add checks for errors in initio_msgin()

On 26.11.2022 00:04, Alexey Khoroshilov wrote:
> The initio_msgin() calls initio_msgin_accept(), initio_msgin_reject()
> and initio_msgin_extend(), but does not check if they are succeed.
> It is not consistent with the other code of the driver.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 72d39fea9017 ("[SCSI] initio: Convert into a real Linux driver and update to modern style")
> Signed-off-by: Semyon Verchenko <semverchenko@...tor-ts.ru>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
> ---
>  drivers/scsi/initio.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/scsi/initio.c b/drivers/scsi/initio.c
> index 375261d67619..ee451aa34143 100644
> --- a/drivers/scsi/initio.c
> +++ b/drivers/scsi/initio.c
> @@ -2065,7 +2065,8 @@ static int initio_msgin(struct initio_host * host)
>  		case SAVE_POINTERS:
>  		case RESTORE_POINTERS:
>  		case NOP:
> -			initio_msgin_accept(host);
> +			if (initio_msgin_accept(host) == -1)
> +				return -1;
>  			break;
>  		case MESSAGE_REJECT:	/* Clear ATN first              */
>  			outb((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)),
> @@ -2074,20 +2075,24 @@ static int initio_msgin(struct initio_host * host)
>  			if ((active_tc->flags & (TCF_SYNC_DONE | TCF_NO_SYNC_NEGO)) == 0)	/* do sync nego */
>  				outb(((inb(host->addr + TUL_SSignal) & (TSC_SET_ACK | 7)) | TSC_SET_ATN),
>  					host->addr + TUL_SSignal);
> -			initio_msgin_accept(host);
> +			if (initio_msgin_accept(host) == -1)
> +				return -1;
>  			break;
>  		case EXTENDED_MESSAGE:	/* extended msg */
> -			initio_msgin_extend(host);
> +			if (initio_msgin_extend(host) == -1)
> +				return -1;
>  			break;
>  		case IGNORE_WIDE_RESIDUE:
> -			initio_msgin_accept(host);
> +			if (initio_msgin_accept(host) == -1)
> +				return -1;
>  			break;
>  		case COMMAND_COMPLETE:
>  			outb(TSC_FLUSH_FIFO, host->addr + TUL_SCtrl0);
>  			outb(TSC_MSG_ACCEPT, host->addr + TUL_SCmd);
>  			return initio_wait_done_disc(host);
>  		default:
> -			initio_msgout_reject(host);
> +			if (initio_msgout_reject(host) == -1)
> +				return -1;
>  			break;
>  		}
>  		if (host->phase != MSG_IN)
> 

Just a friendly reminder)