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 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

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-4.4 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 16:19:30 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@microsoft.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 @@ -378,10 +378,8 @@ 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-4.4/xen-gntdev-fix-off-by-one-error-when-unmapping-with-holes.patch queue-4.4/xen-gntdev-fix-partial-gntdev_mmap-cleanup.patch