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xen-scsiback: safely copy requests

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The copy of the ring request was lacking a following barrier(),
potentially allowing the compiler to optimize the copy away.

Use RING_COPY_REQUEST() to ensure the request is copied to local
memory.

This is part of XSA155.

CC: stable@vger.kernel.org
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
David Vrabel 2015-11-16 18:02:32 +00:00 committed by Konrad Rzeszutek Wilk
parent 1877914910
commit be69746ec1
1 changed files with 1 additions and 1 deletions
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drivers/xen/xen-scsiback.c
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@ -727,7 +727,7 @@ static int scsiback_do_cmd_fn(struct vscsibk_info *info)
if (!pending_req)
return 1;
ring_req = *RING_GET_REQUEST(ring, rc);
RING_COPY_REQUEST(ring, rc, &ring_req);
ring->req_cons = ++rc;
err = prepare_pending_reqs(info, &ring_req, pending_req);