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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <yq1efclinah.fsf@oracle.com>
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