From a3adc9d838d65c596b4479af572c8b1619d01d9f Mon Sep 17 00:00:00 2001 From: Ross Lagerwall Date: Tue, 9 Jan 2018 12:10:21 +0000 Subject: [PATCH] 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 Reviewed-by: Boris Ostrovsky Signed-off-by: Boris Ostrovsky Signed-off-by: Sasha Levin --- drivers/xen/gntdev.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index cea37ee4c615..fc94f0ec6f29 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -378,10 +378,8 @@ 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); -- 2.34.1