On Thu, May 25, 2017 at 11:43:14AM -0700, Bart Van Assche wrote:
> Since using scsi_req() is only allowed against request queues for
> which struct scsi_request is the first member of their private
> request data, refuse to submit SCSI commands against a queue for
> which this is not the case.
Is it possible we could catch this earlier and avoid giving out the
layout in the first place?
--b.
>
> References: commit 82ed4db499b8 ("block: split scsi_request out of struct request")
> Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
> Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
> Cc: J. Bruce Fields <bfields@xxxxxxxxxxxx>
> Cc: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
> Cc: Jens Axboe <axboe@xxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxx>
> Cc: Omar Sandoval <osandov@xxxxxx>
> Cc: linux-nfs@xxxxxxxxxxxxxxx
> Cc: linux-block@xxxxxxxxxxxxxxx
> ---
> fs/nfsd/blocklayout.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c
> index fb5213afc854..38e14cf7e74a 100644
> --- a/fs/nfsd/blocklayout.c
> +++ b/fs/nfsd/blocklayout.c
> @@ -219,6 +219,9 @@ static int nfsd4_scsi_identify_device(struct block_device *bdev,
> u8 *buf, *d, type, assoc;
> int error;
>
> + if (WARN_ON_ONCE(!blk_queue_scsi_pdu(q)))
> + return -EINVAL;
> +
> buf = kzalloc(bufflen, GFP_KERNEL);
> if (!buf)
> return -ENOMEM;
> --
> 2.12.2
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