linux-kernel - [PATCH] drm: Add check for encoder in intel_get_crtc_new

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Message-ID: <20240924112023.1071395-1-g.ryurikov@securitycode.ru>
Date: Tue, 24 Sep 2024 14:20:23 +0300
From: George Rurikov <g.ryurikov@...uritycode.ru>
To: Jani Nikula <jani.nikula@...ux.intel.com>
CC: George Rurikov <g.ryurikov@...uritycode.ru>, Rodrigo Vivi
	<rodrigo.vivi@...el.com>, Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>, David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>, <intel-gfx@...ts.freedesktop.org>,
	<intel-xe@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.og>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: [PATCH] drm: Add check for encoder in intel_get_crtc_new_encoder()

If the video card driver could not find the connector assigned to the
current video controller, or if the hardware status has changed so that
a pre-existing connector is no longer active, none of the state
connectors will meet the assignment criteria for the current crtc video
controller.

In the drm_WARN function, encoder->base.dev is called, so
'&encoder->base.dev' will be dereferenced since encoder will still be
initialized NULL.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: e12d6218fda2 ("drm/i915: Reduce bigjoiner special casing")
Cc: stable@...r.kernel.org
Signed-off-by: George Rurikov <g.ryurikov@...uritycode.ru>
---
 drivers/gpu/drm/i915/display/intel_display.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index b4ef4d59da1a..1f25b12e5f67 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -819,9 +819,11 @@ intel_get_crtc_new_encoder(const struct intel_atomic_state *state,
                num_encoders++;
        }

-       drm_WARN(state->base.dev, num_encoders != 1,
+       if (encoder) {
+               drm_WARN(state->base.dev, num_encoders != 1,
                 "%d encoders for pipe %c\n",
                 num_encoders, pipe_name(primary_crtc->pipe));
+       }

        return encoder;
 }
--
2.34.1

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