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authorKeith Packard <keithp@keithp.com>2018-01-19 04:51:59 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2018-01-31 11:27:51 +0300
commit761e05a702f5d537ffcca1ba933f9f0a968aa022 (patch)
treecafe7ff8924cecdcf505b3ba3746f9ca1992e721 /drivers/gpu/drm/drm_auth.c
parent5bffee867df7494ecd32c1e6ec4e8fc934c521b7 (diff)
downloadlinux-761e05a702f5d537ffcca1ba933f9f0a968aa022.tar.xz
drm: Check for lessee in DROP_MASTER ioctl
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: 2ed077e467ee ("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
Diffstat (limited to 'drivers/gpu/drm/drm_auth.c')
-rw-r--r--drivers/gpu/drm/drm_auth.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
index aad468d170a7..d9c0f7573905 100644
--- a/drivers/gpu/drm/drm_auth.c
+++ b/drivers/gpu/drm/drm_auth.c
@@ -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: