Commit 8e43167c authored Jan 09, 2018 by Ross Lagerwall Committed by Greg Kroah-Hartman Mar 03, 2018

xen/gntdev: Fix off-by-one error when unmapping with holes




[ Upstream commit 951a010233625b77cde3430b4b8785a9a22968d1 ]

If the requested range has a hole, the calculation of the number of
pages to unmap is off by one. Fix it.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 56cf3902

drivers/xen/gntdev.c

+1 −3

Original line number	Diff line number	Diff line
		@@ -348,10 +348,8 @@ static int unmap_grant_pages(struct grant_map *map, int offset, int pages)
		}
		range = 0;
		while (range < pages) {
		if (map->unmap_ops[offset+range].handle == -1) {
		range--;
		if (map->unmap_ops[offset+range].handle == -1)
		break;
		}
		range++;
		}
		err = __unmap_grant_pages(map, offset, range);