linux-kernel - Re: [PATCH 1/6] scsi: libsas: Add sas_task_find

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: <99efb876-69b1-eb7c-dfa6-8ac621a25438@huawei.com>
Date:   Wed, 28 Sep 2022 14:56:24 +0100
From:   John Garry <john.garry@...wei.com>
To:     Johannes Thumshirn <Johannes.Thumshirn@....com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "jinpu.wang@...ud.ionos.com" <jinpu.wang@...ud.ionos.com>,
        Damien Le Moal <Damien.LeMoal@....com>
CC:     "hare@...e.de" <hare@...e.de>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>,
        "ipylypiv@...gle.com" <ipylypiv@...gle.com>,
        "changyuanl@...gle.com" <changyuanl@...gle.com>,
        "hch@....de" <hch@....de>
Subject: Re: [PATCH 1/6] scsi: libsas: Add sas_task_find_rq()

On 28/09/2022 14:17, Johannes Thumshirn wrote:
>> +static inline struct request *sas_task_find_rq(struct sas_task *task)
>> +{
>> +	struct scsi_cmnd *scmd;
>> +
>> +	if (!task || !task->uldd_task)
>> +		return NULL;
> Is anyone actually calling sas_task_find_rq with a NULL task?

Yeah, unfortunately. An example - the only one I think - is in the 
pm8001 driver: pm8001_ccb_alloc() function which takes a task pointer 
which may be NULL, and this function calls sas_task_find_rq()

> That doesn't make a lot of sense from an API POV for me, having
> the only argument allowed to be NULL (and not being a *free()
> kind of function).

I suppose that I could change to only call sas_task_find_rq() for 
non-NULL sas_task pointers (and remove the task check).

Thanks,
John