From patchwork Wed Mar 15 13:09:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Ahmad Fatoum X-Patchwork-Id: 13175823 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDD85C61DA4 for ; Wed, 15 Mar 2023 13:09:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231773AbjCONJx (ORCPT ); Wed, 15 Mar 2023 09:09:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54622 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232126AbjCONJt (ORCPT ); Wed, 15 Mar 2023 09:09:49 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37D8A17162 for ; Wed, 15 Mar 2023 06:09:46 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pcQso-0004kr-V5; Wed, 15 Mar 2023 14:09:34 +0100 Received: from [2a0a:edc0:0:1101:1d::54] (helo=dude05.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1pcQsm-004JKR-O2; Wed, 15 Mar 2023 14:09:32 +0100 Received: from afa by dude05.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1pcQsm-00FFGc-4Q; Wed, 15 Mar 2023 14:09:32 +0100 From: Ahmad Fatoum To: Linus Walleij , =?utf-8?q?Alvin_=C5=A0ipraga?= , Andrew Lunn , Florian Fainelli , Vladimir Oltean , Luiz Angelo Daros de Luca , "David S. Miller" Cc: kernel@pengutronix.de, Ahmad Fatoum , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net 1/2] net: dsa: realtek: fix out-of-bounds access Date: Wed, 15 Mar 2023 14:09:15 +0100 Message-Id: <20230315130917.3633491-1-a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: afa@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org The probe function sets priv->chip_data to (void *)priv + sizeof(*priv) with the expectation that priv has enough trailing space. However, only realtek-smi actually allocated this chip_data space. Do likewise in realtek-mdio to fix out-of-bounds accesses. Fixes: aac94001067d ("net: dsa: realtek: add new mdio interface for drivers") Signed-off-by: Ahmad Fatoum Reviewed-by: Linus Walleij Reviewed-by: Alvin Šipraga Reviewed-by: Florian Fainelli Reviewed-by: Luiz Angelo Daros de Luca --- drivers/net/dsa/realtek/realtek-mdio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/dsa/realtek/realtek-mdio.c b/drivers/net/dsa/realtek/realtek-mdio.c index 3e54fac5f902..3b22d3f7ad99 100644 --- a/drivers/net/dsa/realtek/realtek-mdio.c +++ b/drivers/net/dsa/realtek/realtek-mdio.c @@ -152,7 +152,7 @@ static int realtek_mdio_probe(struct mdio_device *mdiodev) if (!var) return -EINVAL; - priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv), GFP_KERNEL); + priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv) + var->chip_data_sz, GFP_KERNEL); if (!priv) return -ENOMEM;