linux-kernel - Re: [PATCH] scsi: megaraid: Fix null dereference

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Date:   Mon, 03 Apr 2023 11:19:00 -0400
From:   James Bottomley <jejb@...ux.ibm.com>
To:     Igor Artemiev <Igor.A.Artemiev@...t.ru>,
        Kashyap Desai <kashyap.desai@...adcom.com>
Cc:     Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] scsi: megaraid: Fix null dereference

On Mon, 2023-04-03 at 17:34 +0300, Igor Artemiev wrote:
> When cmdid == CMDID_INT_CMDS, the 'mbox' pointer is NULL but is
> dereferenced below.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 0f2bb84d2a68 ("[SCSI] megaraid: simplify internal command
> handling")
> Signed-off-by: Igor Artemiev <Igor.A.Artemiev@...t.ru>
> ---
>  drivers/scsi/megaraid.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
> index bf491af9f0d6..4fbf92dc717e 100644
> --- a/drivers/scsi/megaraid.c
> +++ b/drivers/scsi/megaraid.c
> @@ -1441,6 +1441,7 @@ mega_cmd_done(adapter_t *adapter, u8
> completed[], int nstatus, int status)
>                  */
>                 if (cmdid == CMDID_INT_CMDS) {
>                         scb = &adapter->int_scb;
> +                       mbox = (mbox_t *)scb->raw_mbox;

Have you actually seen this and if so which firmware?  I thought
megaraid internal commands only ever returned success or fail (0 or 1)
meaning they can never get into the sense processing case that is the
only consumer of the mbox.

James