Patch "xen/gntdev: Fix off-by-one error when unmapping with holes" has been added to the 4.14-stable tree

Patch "xen/gntdev: Fix off-by-one error when unmapping with holes" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     xen-gntdev-fix-off-by-one-error-when-unmapping-with-holes.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Feb 28 16:23:28 CET 2018
From: Ross Lagerwall <ross.lagerwall@citrix.com>
Date: Tue, 9 Jan 2018 12:10:21 +0000
Subject: xen/gntdev: Fix off-by-one error when unmapping with holes

From: Ross Lagerwall <ross.lagerwall@citrix.com>


[ 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@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/xen/gntdev.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -380,10 +380,8 @@ static int unmap_grant_pages(struct gran
 		}
 		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);


Patches currently in stable-queue which might be from ross.lagerwall@citrix.com are

queue-4.14/xen-gntdev-fix-off-by-one-error-when-unmapping-with-holes.patch
queue-4.14/xen-gntdev-fix-partial-gntdev_mmap-cleanup.patch