drm/lease: fix WARNING in idr_destroy

commit b216a8e7908cd750550c0480cf7d2b3a37f06954 upstream.

drm_lease_create takes ownership of leases. And leases will be released
by drm_master_put.

drm_master_put
    ->drm_master_destroy
            ->idr_destroy

So we needn't call idr_destroy again.

Reported-and-tested-by: syzbot+05835159fe322770fe3d@syzkaller.appspotmail.com
Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1584518030-4173-1-git-send-email-hqjagain@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c
index b481caf..825abe3 100644 (file)
--- a/drivers/gpu/drm/drm_lease.c
+++ b/drivers/gpu/drm/drm_lease.c
@@ -542,10 +542,12 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
        }
 
        DRM_DEBUG_LEASE("Creating lease\n");
+       /* lessee will take the ownership of leases */
        lessee = drm_lease_create(lessor, &leases);
 
        if (IS_ERR(lessee)) {
                ret = PTR_ERR(lessee);
+               idr_destroy(&leases);
                goto out_leases;
        }
 
@@ -580,7 +582,6 @@ out_lessee:
 
 out_leases:
        put_unused_fd(fd);
-       idr_destroy(&leases);
 
        DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl failed: %d\n", ret);
        return ret;