[Xen-devel] [PATCH 1/2] xen/gntdev: Fix off-by-one error when unmapping with holes

[Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>]

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@xxxxxxxxxx>
---
 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 57efbd3..d3391a1 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -380,10 +380,8 @@ 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);
-- 
2.9.5


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