diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2018-12-30 15:28:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-27 08:14:42 +0300 |
| commit | 015b828bd66d1393163db003e8db542797a52869 (patch) | |
| tree | e906e1f1c4760035868ec2f26e089c94493fe470 | |
| parent | e365b94086f9dec02ddfcc193dcad72858c6d973 (diff) | |
| download | linux-015b828bd66d1393163db003e8db542797a52869.tar.xz | |
drm: Reorder set_property_atomic to avoid returning with an active ww_ctx
commit 227ad6d957898a88b1746e30234ece64d305f066 upstream.
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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpu/drm/drm_mode_object.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c index fcb0ab0abb75..57cc9aa6683a 100644 --- a/drivers/gpu/drm/drm_mode_object.c +++ b/drivers/gpu/drm/drm_mode_object.c @@ -458,12 +458,13 @@ 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) { |