drm: Reorder set_property_atomic to avoid returning with an active ww_ctx

Delay the drm_modeset_acquire_init() until after we check for an
allocation failure so that we can return immediately upon error without
having to unwind.

WARNING: lock held when returning to user space!
4.20.0+ #174 Not tainted
------------------------------------------------
syz-executor556/8153 is leaving the kernel with locks still held!
1 lock held by syz-executor556/8153:
  #0: 000000005100c85c (crtc_ww_class_acquire){+.+.}, at:
set_property_atomic+0xb3/0x330 drivers/gpu/drm/drm_mode_object.c:462

Reported-by: syzbot+6ea337c427f5083ebdf2@syzkaller.appspotmail.com
Fixes: 144a7999d633 ("drm: Handle properties in the core for atomic drivers")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: <stable@vger.kernel.org> # v4.14+
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181230122842.21917-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
index bb1dd46496cd03292f6ef6b675d63bf7cd423bd4..a9005c1c23848791fce2a6b6a4c9920581341069 100644 (file)
--- a/drivers/gpu/drm/drm_mode_object.c
+++ b/drivers/gpu/drm/drm_mode_object.c
@@ -459,12 +459,13 @@ static int set_property_atomic(struct drm_mode_object *obj,
        struct drm_modeset_acquire_ctx ctx;
        int ret;
 
-       drm_modeset_acquire_init(&ctx, 0);
-
        state = drm_atomic_state_alloc(dev);
        if (!state)
                return -ENOMEM;
+
+       drm_modeset_acquire_init(&ctx, 0);
        state->acquire_ctx = &ctx;
+
 retry:
        if (prop == state->dev->mode_config.dpms_property) {
                if (obj->type != DRM_MODE_OBJECT_CONNECTOR) {