From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 03566629 for ; Wed, 2 Nov 2022 03:00:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E60FC433D6; Wed, 2 Nov 2022 03:00:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1667358054; bh=yE7tl7tXmrRB2InCFJjreR8scR3NdMbpRgdA3ETg85M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fVayarZgCYlozTB3tyiWr5vBdTx5iRKT/Bkp9C/BZuo6VwmeVkyPXxLx5wVwweH98 iP1A7vwY0XQoUyOER5E4k2C+5GcVSw3ZAPEYYIvtkCUf5GUGGg1iPO8fbV1AMOC9Vg ufi3k0NO4LdtjcPkWwXAu5nIJR/IHA8EWDjxsCGk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Johan Hovold , Kuogee Hsieh , Dmitry Baryshkov , Abhinav Kumar Subject: [PATCH 5.15 033/132] drm/msm/hdmi: fix memory corruption with too many bridges Date: Wed, 2 Nov 2022 03:32:19 +0100 Message-Id: <20221102022100.504032202@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221102022059.593236470@linuxfoundation.org> References: <20221102022059.593236470@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Johan Hovold commit 4c1294da6aed1f16d47a417dcfe6602833c3c95c upstream. Add the missing sanity check on the bridge counter to avoid corrupting data beyond the fixed-sized bridge array in case there are ever more than eight bridges. Fixes: a3376e3ec81c ("drm/msm: convert to drm_bridge") Cc: stable@vger.kernel.org # 3.12 Signed-off-by: Johan Hovold Tested-by: Kuogee Hsieh Reviewed-by: Kuogee Hsieh Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/502670/ Link: https://lore.kernel.org/r/20220913085320.8577-5-johan+linaro@kernel.org Signed-off-by: Abhinav Kumar Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/msm/hdmi/hdmi.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/gpu/drm/msm/hdmi/hdmi.c +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c @@ -295,6 +295,11 @@ int msm_hdmi_modeset_init(struct hdmi *h struct platform_device *pdev = hdmi->pdev; int ret; + if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) { + DRM_DEV_ERROR(dev->dev, "too many bridges\n"); + return -ENOSPC; + } + hdmi->dev = dev; hdmi->encoder = encoder;