From: Sagi Grimberg <sagi@grimberg.me>
To: Daniel Wagner <dwagner@suse.de>, linux-nvme@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, Jens Axboe <axboe@fb.com>,
Hannes Reinecke <hare@suse.de>, Keith Busch <kbusch@kernel.org>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v2] nvme-tcp: Check if request has started before processing it
Date: Fri, 5 Mar 2021 11:57:30 -0800 [thread overview]
Message-ID: <6b51a989-5551-e243-abda-5872411ec3ff@grimberg.me> (raw)
In-Reply-To: <20210301175601.116405-1-dwagner@suse.de>
> blk_mq_tag_to_rq() always returns a request if the tag id is in a
> valid range [0...max_tags). If the target replies with a tag for which
> we don't have a request but it's not started, the host will likely
> corrupt data or simply crash.
>
> Add an additional check if the a request has been started if not
> reset the connection.
>
> This addition check will not protected against an invalid tag which
> maps to a request which has been started. There is nothing we can do
> about this. Though it will at a least protect from crashing the host,
> which generally thought to be the right thing to do.
Daniel, again, there is nothing specific about this to nvme-tcp,
this is a safeguard against a funky controller (or a different
bug that is hidden by this). The same can happen in any other
transport so I would suggest that if this is a safeguard we
want to put in place, we should make it a generic one.
i.e. nvme_tag_to_rq() that _all_ transports call consistently.
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next prev parent reply other threads:[~2021-03-05 19:58 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-01 17:56 [PATCH v2] nvme-tcp: Check if request has started before processing it Daniel Wagner
2021-03-05 19:57 ` Sagi Grimberg [this message]
2021-03-11 9:43 ` Daniel Wagner
2021-03-15 17:16 ` Sagi Grimberg
2021-03-30 16:19 ` Ewan D. Milne
2021-03-30 17:34 ` Sagi Grimberg
2021-03-30 23:28 ` Keith Busch
2021-03-31 7:11 ` Hannes Reinecke
2021-03-31 21:01 ` Ewan D. Milne
2021-03-31 22:24 ` Sagi Grimberg
2021-04-01 6:20 ` Christoph Hellwig
2021-04-01 8:25 ` Sagi Grimberg
2021-03-31 22:37 ` Sagi Grimberg
2021-05-06 15:36 ` Hannes Reinecke
2021-05-07 20:26 ` Sagi Grimberg
2021-05-07 20:40 ` Keith Busch
2021-05-07 23:22 ` Sagi Grimberg
2021-05-08 0:03 ` Keith Busch
2021-05-09 11:30 ` Hannes Reinecke
2021-05-11 18:16 ` Sagi Grimberg
2021-05-17 14:58 ` Daniel Wagner
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