linux-kernel - Re: [PATCH] scsi: sd: call device_del() if device_add

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: <20220331162416.GI12805@kadam>
Date:   Thu, 31 Mar 2022 19:24:16 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     Wenchao Hao <haowenchao@...wei.com>,
        syzkaller-bugs@...glegroups.com, axboe@...nel.dk,
        jejb@...ux.ibm.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        martin.petersen@...cle.com,
        syzbot+f08c77040fa163a75a46@...kaller.appspotmail.com,
        linfeilong@...wei.com
Subject: Re: [PATCH] scsi: sd: call device_del() if device_add_disk() fails

On Thu, Mar 31, 2022 at 06:14:27PM +0200, Fabio M. De Francesco wrote:
> On gioved? 31 marzo 2022 15:42:10 CEST Dan Carpenter wrote:
> > Wenchao Hao, what you're saying makes a lot of sense but it raises a lot
> > of questions in turn.
> > 
> > Fabio, did you test your patch?
> 
> Yes, I did, Dan. I tested it the usual way with the "#syz test:" command.
> Obviously I have not the hardware to test code on it.
> 

Yeah.  What a nightmare.  You posted a link to the first test.  It said
passed but definitely introduced some use after frees but how was anyone
supposed to know?

No way we would have figured this out.  I'm working to make Smatch
understand device_put() better but this one is way difficult.

Sorry that you went through this.

regards,
dan carpenter