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

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[ 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>
This commit is contained in:
Ross Lagerwall 2018-01-09 12:10:21 +00:00 committed by Greg Kroah-Hartman
parent 1bb81106a1
commit beaa7d1cea
1 changed files with 1 additions and 3 deletions
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4
drivers/xen/gntdev.c
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@ -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);