linux-kernel - Re: [PATCH v2] scsi: hisi_sas: Fix NULL pointer dereference

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Date:   Fri, 19 Oct 2018 18:28:38 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     John Garry <john.garry@...wei.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Xiang Chen <chenxiang66@...ilicon.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] scsi: hisi_sas: Fix NULL pointer dereference


Gustavo,

> There is a NULL pointer dereference in case *slot* happens to
> be NULL at lines 1053 and 1878:
>
> struct hisi_sas_cq *cq =
> 	&hisi_hba->cq[slot->dlvry_queue];
>
> Notice that *slot* is being NULL checked at lines 1057 and 1881:
> if (slot), which implies it may be NULL.
>
> Fix this by placing the declaration and definition of variable cq,
> which contains the pointer dereference slot->dlvry_queue, after
> slot has been properly NULL checked.

Applied to 4.20/scsi-queue, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering