From mboxrd@z Thu Jan 1 00:00:00 1970 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 94BE7C00145 for ; Mon, 12 Dec 2022 13:42:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232186AbiLLNmQ (ORCPT ); Mon, 12 Dec 2022 08:42:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232948AbiLLNlh (ORCPT ); Mon, 12 Dec 2022 08:41:37 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 149A513F92 for ; Mon, 12 Dec 2022 05:41:05 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 037C3B8068B for ; Mon, 12 Dec 2022 13:41:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 21287C433EF; Mon, 12 Dec 2022 13:41:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670852462; bh=bjKzL0ABmnz7AqXAK9DkHcuh9Yodcz4M6I1m/3Xyyj0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IiF0exgebkBcXZMdS0wT4ILLLFIKptAaedH/gpdWZBVFD4Sh8Lfe6yBseZWSTf0Xr 2JZl2tuC+uN3ahmLDiJT+bNdzSpTjAq0AgBCxSb9Zy0mUudyACnPcOSf82OqatpTnV SMoIBu9W8uS23jFv35UsgzY7oBNHU0xk6DALwMEU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+2d7f58292cb5b29eb5ad@syzkaller.appspotmail.com, Wei Chen , Oliver Hartkopp , Marc Kleine-Budde Subject: [PATCH 6.0 085/157] can: af_can: fix NULL pointer dereference in can_rcv_filter Date: Mon, 12 Dec 2022 14:17:13 +0100 Message-Id: <20221212130938.206109341@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221212130934.337225088@linuxfoundation.org> References: <20221212130934.337225088@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Oliver Hartkopp commit 0acc442309a0a1b01bcdaa135e56e6398a49439c upstream. Analogue to commit 8aa59e355949 ("can: af_can: fix NULL pointer dereference in can_rx_register()") we need to check for a missing initialization of ml_priv in the receive path of CAN frames. Since commit 4e096a18867a ("net: introduce CAN specific pointer in the struct net_device") the check for dev->type to be ARPHRD_CAN is not sufficient anymore since bonding or tun netdevices claim to be CAN devices but do not initialize ml_priv accordingly. Fixes: 4e096a18867a ("net: introduce CAN specific pointer in the struct net_device") Reported-by: syzbot+2d7f58292cb5b29eb5ad@syzkaller.appspotmail.com Reported-by: Wei Chen Signed-off-by: Oliver Hartkopp Link: https://lore.kernel.org/all/20221206201259.3028-1-socketcan@hartkopp.net Cc: stable@vger.kernel.org Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- net/can/af_can.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -680,7 +680,7 @@ static int can_rcv(struct sk_buff *skb, { struct canfd_frame *cfd = (struct canfd_frame *)skb->data; - if (unlikely(dev->type != ARPHRD_CAN || skb->len != CAN_MTU)) { + if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) || skb->len != CAN_MTU)) { pr_warn_once("PF_CAN: dropped non conform CAN skbuff: dev type %d, len %d\n", dev->type, skb->len); goto free_skb; @@ -706,7 +706,7 @@ static int canfd_rcv(struct sk_buff *skb { struct canfd_frame *cfd = (struct canfd_frame *)skb->data; - if (unlikely(dev->type != ARPHRD_CAN || skb->len != CANFD_MTU)) { + if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) || skb->len != CANFD_MTU)) { pr_warn_once("PF_CAN: dropped non conform CAN FD skbuff: dev type %d, len %d\n", dev->type, skb->len); goto free_skb;