From f3eb9b8f67bc28783eddc142ad805ebdc53d6339 Mon Sep 17 00:00:00 2001 From: Jia-Ju Bai Date: Mon, 29 Jul 2019 16:36:44 +0800 Subject: [PATCH] gpu: drm: radeon: Fix a possible null-pointer dereference in radeon_connector_set_property() In radeon_connector_set_property(), there is an if statement on line 743 to check whether connector->encoder is NULL: if (connector->encoder) When connector->encoder is NULL, it is used on line 755: if (connector->encoder->crtc) Thus, a possible null-pointer dereference may occur. To fix this bug, connector->encoder is checked before being used. This bug is found by a static analysis tool STCheck written by us. Signed-off-by: Jia-Ju Bai Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/radeon_connectors.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c index c60d1a4..b684cd7 100644 --- a/drivers/gpu/drm/radeon/radeon_connectors.c +++ b/drivers/gpu/drm/radeon/radeon_connectors.c @@ -752,7 +752,7 @@ static int radeon_connector_set_property(struct drm_connector *connector, struct radeon_encoder->output_csc = val; - if (connector->encoder->crtc) { + if (connector->encoder && connector->encoder->crtc) { struct drm_crtc *crtc = connector->encoder->crtc; struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc); -- 2.7.4