tree cf6489c8da0e740f8cc54d615869249726207320
parent 8e22f6848fc80c34ce7e7bf2bdbd5c8fb54e2fe4
author Roger Pau Monne <roger.pau@citrix.com> 1595841219 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1597817707 +0200

xen/balloon: fix accounting in alloc_xenballooned_pages error path

commit 1951fa33ec259abdf3497bfee7b63e7ddbb1a394 upstream.

target_unpopulated is incremented with nr_pages at the start of the
function, but the call to free_xenballooned_pages will only subtract
pgno number of pages, and thus the rest need to be subtracted before
returning or else accounting will be skewed.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200727091342.52325-2-roger.pau@citrix.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>