Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-03 01:21:28 +00:00
Code Issues Packages Projects Releases Wiki Activity

drm: Check for lessee in DROP_MASTER ioctl

Browse Source 
Don't let a lessee control what the current DRM master is set to;
that's the job of the "real" master. Otherwise, the lessee would
disable all access to master operations for the owner and all lessees
under it.

This matches the same check made in the SET_MASTER ioctl.

Signed-off-by: Keith Packard <keithp@keithp.com>
Fixes: 2ed077e467 ("drm: Add drm_object lease infrastructure [v5]")
Cc: <stable@vger.kernel.org> # v4.15+
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180119015159.1606-1-keithp@keithp.com
This commit is contained in:
Keith Packard 2018-01-18 17:51:59 -08:00 committed by Daniel Vetter
parent 5bffee867d
commit 761e05a702
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/drm_auth.c
View File

@ -230,6 +230,12 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
if (!dev->master)
goto out_unlock;
if (file_priv->master->lessor != NULL) {
DRM_DEBUG_LEASE("Attempt to drop lessee %d as master\n", file_priv->master->lessee_id);
ret = -EINVAL;
goto out_unlock;
}
ret = 0;
drm_drop_master(dev, file_priv);
out_unlock: