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 10:19:45 +0100 |
| commit | 041250d9c35afde56628f11c4ed6d59d701b0b4c (patch) | |
| tree | b45bb72978b396f656d94d2d833da600d1bd77f0 | |
| parent | 2ca929480b7b03c064c2258891f0bcd6f53122cc (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 44a9d8eb0eb4..1865bcfa869b 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -874,8 +874,10 @@ 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; } |