diff options
| author | Ross Lagerwall <ross.lagerwall@citrix.com> | 2018-01-09 12:10:22 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-03 10:17:11 +0100 |
| commit | 99a318ec9d85150ca6f4834c1ec40bf816cec2fb (patch) | |
| tree | 94d5be08ec959681d5046e21de724a64e14f1e20 | |
| parent | 8e43167ca9876f2e1ef65ac40b533440c9ab2e27 (diff) | |
xen/gntdev: Fix partial gntdev_mmap() cleanup
[ Upstream commit cf2acf66ad43abb39735568f55e1f85f9844e990 ]
When cleaning up after a partially successful gntdev_mmap(), unmap the
successfully mapped grant pages otherwise Xen will kill the domain if
in debug mode (Attempt to implicitly unmap a granted PTE) or Linux will
kill the process and emit "BUG: Bad page map in process" if Xen is in
release mode.
This is only needed when use_ptemod is true because gntdev_put_map()
will unmap grant pages itself when use_ptemod is false.
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>
| -rw-r--r-- | drivers/xen/gntdev.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 1c03e30f66b4..5ad2534480ff 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -817,8 +817,10 @@ unlock_out: out_unlock_put: mutex_unlock(&priv->lock); out_put_map: - if (use_ptemod) + if (use_ptemod) { map->vma = NULL; + unmap_grant_pages(map, 0, map->count); + } gntdev_put_map(priv, map); return err; } |