Commit cd659881 authored by Ross Lagerwall's avatar Ross Lagerwall Committed by Greg Kroah-Hartman

xen/gntdev: Fix partial gntdev_mmap() cleanup

[ Upstream commit cf2acf66 ]

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: default avatarRoss Lagerwall <>
Reviewed-by: default avatarBoris Ostrovsky <>
Signed-off-by: default avatarBoris Ostrovsky <>
Signed-off-by: default avatarSasha Levin <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 5aee2c14
......@@ -1071,8 +1071,10 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
if (use_ptemod)
if (use_ptemod) {
map->vma = NULL;
unmap_grant_pages(map, 0, map->count);
gntdev_put_map(priv, map);
return err;
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