tree ad58a5df9ceb6262fe2d1b519719d218c5cc133f
parent c8c9ba5f928ca46e18438b0fac77eb72b36361f5
author Juergen Gross <jgross@suse.com> 1638187646 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1638949504 +0100

xen/blkfront: read response from backend only once

commit 71b66243f9898d0e54296b4e7035fb33cdcb0707 upstream.

In order to avoid problems in case the backend is modifying a response
on the ring page while the frontend has already seen it, just read the
response into a local buffer in one go and then operate on that buffer
only.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Link: https://lore.kernel.org/r/20210730103854.12681-2-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>