linux-kernel - Re: [PATCH v2] scsi: sd: don't crash the host on invalid commands

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Message-ID: <e082c821-e019-7e41-12b8-5295a207d3fb@acm.org>
Date:   Fri, 21 Sep 2018 06:52:35 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Johannes Thumshirn <jthumshirn@...e.de>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Linux SCSI Mailinglist <linux-scsi@...r.kernel.org>,
        Hannes Reinecke <hare@...e.de>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2] scsi: sd: don't crash the host on invalid commands

On 9/21/18 12:01 AM, Johannes Thumshirn wrote:
> When sd_init_command() get's a with a unknown req_op() it crashes the
> system via BUG().
> 
> This makes debugging the actual reason for the broken request
> cmd_flags pretty hard as the system is down before it's able to write
> out debugging data on the serial console or the trace buffer.
> 
> Change the BUG() to a WARN_ON() and return BLKPREP_KILL to fail
> gracefully and return an I/O error to the producer of the request.

Reviewed-by: Bart Van Assche <bvanassche@....org>