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Commit 951a0102 authored by Ross Lagerwall's avatar Ross Lagerwall Committed by Boris Ostrovsky
Browse files

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



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: default avatarRoss Lagerwall <ross.lagerwall@citrix.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent 66a640e7

drivers/xen/gntdev.c

+1 −3
Original line number Diff line number Diff line
@@ -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);