linux-kernel - Re: [PATCH 1/1] block: fix potential infinite loop in the negative branch in __submit_bio_noacct

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] [day] [month] [year] [list]

Message-ID: <20210324151405.GA4260@veeam.com>
Date:   Wed, 24 Mar 2021 18:14:05 +0300
From:   Sergei Shtepa <sergei.shtepa@...am.com>
To:     Christoph Hellwig <hch@...radead.org>
CC:     Jens Axboe <axboe@...nel.dk>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <pavel.tide@...am.com>
Subject: Re: [PATCH 1/1] block: fix potential infinite loop in the negative
 branch in __submit_bio_noacct_mq()

The 03/24/2021 11:18, Christoph Hellwig wrote:
> On Tue, Mar 23, 2021 at 02:48:36PM +0300, Sergei Shtepa wrote:
> > When the blk_crypto_bio_prep() function returns false, the processing
> > of the bio request must end. Repeated access to blk_crypto_bio_prep()
> > for this same bio may lead to access to already released data, since in
> > this case the bio_endio() function was already called for bio.
> > 
> > The changes allow to leave the processing of the failed bio and
> > go to the next one from the bio_list.
> > 
> > The error can only occur when using inline encryption on
> > request-based blk-mq devices and something went wrong in the
> > __blk_crypto_bio_prep().
> 
> A continue in a do { } while statement evaluates the while condition,
> so your patch is a no-op.

Thank you Christoph!
Shame on my bald head.
I apologize and will be more attentive in the future.
-- 
Sergei Shtepa
Veeam Software developer.