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 8C221629 for ; Wed, 2 Nov 2022 03:30:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 99810C433D6; Wed, 2 Nov 2022 03:30:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1667359819; bh=p+gswbO3Cw1i0MlIrLMMH+EZYyIZf1zRCz15aYfaa4Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RD2/zoqpwIz4LV+rTzKou7BELr9VHwR6DVQEDNTfXUWnKZpLDO5Fzaa/dWoeKFTCT w1IG3uT9uQmqLMYh8XPAcqC5WtvirJEECDcZXSVRknX9uQQopdmN2lMPi397bbEdxq 5gpFHGNT6mdinYho8LEFIGXmIMyZyeBBQ2gy2Dys= 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 4.19 39/78] drm/msm/dsi: fix memory corruption with too many bridges Date: Wed, 2 Nov 2022 03:34:24 +0100 Message-Id: <20221102022054.137812051@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221102022052.895556444@linuxfoundation.org> References: <20221102022052.895556444@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 2e786eb2f9cebb07e317226b60054df510b60c65 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: a689554ba6ed ("drm/msm: Initial add DSI connector support") Cc: stable@vger.kernel.org # 4.1 Signed-off-by: Johan Hovold Tested-by: Kuogee Hsieh Reviewed-by: Kuogee Hsieh Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/502668/ Link: https://lore.kernel.org/r/20220913085320.8577-4-johan+linaro@kernel.org Signed-off-by: Abhinav Kumar Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/msm/dsi/dsi.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/gpu/drm/msm/dsi/dsi.c +++ b/drivers/gpu/drm/msm/dsi/dsi.c @@ -200,6 +200,12 @@ int msm_dsi_modeset_init(struct msm_dsi return -EINVAL; priv = dev->dev_private; + + if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) { + DRM_DEV_ERROR(dev->dev, "too many bridges\n"); + return -ENOSPC; + } + msm_dsi->dev = dev; ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);