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bh=upUdRNc2H9LGx6pOVpcm0rc5dRiRMZ/3v9/QOVk8QmY=; b=hAPzMN8iZFz7B2++PM1hvSL2T7NxC9DQQUVX3Q46Vh2kkBhdK4EmymEt AbNMtdp4DZNilvi+woZZY6ubPzultbmx9AH4vmluCnFs4D/6oAI8XslaQ x5nEf0qoIoCm75XHKrRyni/m93wM1+pmJ77AeLkRRzNPWDD3i+fGOi/0v CayNVmmZKmeo8sq59wZqIzo3I7o53t8hbDuT8SeJU58IolSgYZUUcVIuU jyfyzkYjpw4QJyf49UiK7rtrmrE3I3sMcLJByajSP9LUenmdJMhl0rsE7 BLdHHD1H/wk27yLmVs98I2UEqC3ZNT+7FYVA1zKx/A2pD6seCPYJS/evw g==; X-IronPort-AV: E=Sophos;i="5.88,336,1635199200"; d="scan'208";a="21844620" Received: from vtuxmail01.tq-net.de ([10.115.0.20]) by mx1.tq-group.com with ESMTP; 02 Feb 2022 09:18:04 +0100 Received: from steina-w.tq-net.de (unknown [10.123.49.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by vtuxmail01.tq-net.de (Postfix) with ESMTPSA id 9A03E280065; Wed, 2 Feb 2022 09:18:04 +0100 (CET) From: Alexander Stein To: Marek Vasut , Stefan Agner , David Airlie , Daniel Vetter , Shawn Guo , Sascha Hauer , Fabio Estevam Cc: Alexander Stein , linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org Subject: [PATCH v2 2/2] drm: mxsfb: Fix NULL pointer dereference Date: Wed, 2 Feb 2022 09:17:55 +0100 Message-Id: <20220202081755.145716-3-alexander.stein@ew.tq-group.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220202081755.145716-1-alexander.stein@ew.tq-group.com> References: <20220202081755.145716-1-alexander.stein@ew.tq-group.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220202_001814_832707_E4185B58 X-CRM114-Status: GOOD ( 13.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org mxsfb should not never dereference the NULL pointer which drm_atomic_get_new_bridge_state is allowed to return. Assume a fixed format instead. Fixes: commit b776b0f00f24 ("drm: mxsfb: Use bus_format from the nearest bridge if present") Signed-off-by: Alexander Stein --- drivers/gpu/drm/mxsfb/mxsfb_kms.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c index 0655582ae8ed..4cfb6c001679 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c @@ -361,7 +361,11 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc, bridge_state = drm_atomic_get_new_bridge_state(state, mxsfb->bridge); - bus_format = bridge_state->input_bus_cfg.format; + if (!bridge_state) + bus_format = MEDIA_BUS_FMT_FIXED; + else + bus_format = bridge_state->input_bus_cfg.format; + if (bus_format == MEDIA_BUS_FMT_FIXED) { dev_warn_once(drm->dev, "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"