5.0-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 227ad6d957898a88b1746e30234ece64d305f066 ]
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@c...
Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/drm_mode_object.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c index 004191d01772..15b919f90c5a 100644 --- a/drivers/gpu/drm/drm_mode_object.c +++ b/drivers/gpu/drm/drm_mode_object.c @@ -465,6 +465,7 @@ static int set_property_atomic(struct drm_mode_object *obj,
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) {