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 X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A9E5C43381 for ; Mon, 1 Apr 2019 17:16:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3059E21473 for ; Mon, 1 Apr 2019 17:16:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554138988; bh=IXmJjoPPjrcVBEREx7Xsb5CJscxAl6a0+DIB1uUGc6s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=X/0Q3HxZBue6Rs1HVmM8cZnWFfkrae2RAlr73YC8C+bKt33C1rMZM0REfzYsP7FOB h/N7rhXQ8QNJZ0KOIvHYQ0yvFYV+cXzDyzARoJBDDa6X5ff8ZVnVQaI5VHVO22NZFv o5cL+6YxbIl8G1H4Kis1T4xMjCF8D7a5EpTsvggU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731015AbfDARQ1 (ORCPT ); Mon, 1 Apr 2019 13:16:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:41490 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730603AbfDARQV (ORCPT ); Mon, 1 Apr 2019 13:16:21 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C1E7420856; Mon, 1 Apr 2019 17:16:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554138980; bh=IXmJjoPPjrcVBEREx7Xsb5CJscxAl6a0+DIB1uUGc6s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WibGTrdrQgqphUCtyAqyBxlM3rUv3oQckXk+Glh14EdIll056cKFXSokKXO24Trat dmYrFBGzEiwsghRMuTFCirvmrKQhbWo+rvX6oI23137X78FV72cP4t9LbRGA1lOvhA 9rrfwdFGPcnM3wJBR/c/VRm9Vu1vJiyBzHqeyzoM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, John Hurley , Jakub Kicinski , Cong Wang , "David S. Miller" Subject: [PATCH 4.19 029/134] net: sched: fix cleanup NULL pointer exception in act_mirr Date: Mon, 1 Apr 2019 19:01:05 +0200 Message-Id: <20190401170047.305233006@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190401170044.243719205@linuxfoundation.org> References: <20190401170044.243719205@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: John Hurley [ Upstream commit 064c5d6881e897077639e04973de26440ee205e6 ] A new mirred action is created by the tcf_mirred_init function. This contains a list head struct which is inserted into a global list on successful creation of a new action. However, after a creation, it is still possible to error out and call the tcf_idr_release function. This, in turn, calls the act_mirr cleanup function via __tcf_idr_release and __tcf_action_put. This cleanup function tries to delete the list entry which is as yet uninitialised, leading to a NULL pointer exception. Fix this by initialising the list entry on creation of a new action. Bug report: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 PGD 8000000840c73067 P4D 8000000840c73067 PUD 858dcc067 PMD 0 Oops: 0002 [#1] SMP PTI CPU: 32 PID: 5636 Comm: handler194 Tainted: G OE 5.0.0+ #186 Hardware name: Dell Inc. PowerEdge R730/0599V5, BIOS 1.3.6 06/03/2015 RIP: 0010:tcf_mirred_release+0x42/0xa7 [act_mirred] Code: f0 90 39 c0 e8 52 04 57 c8 48 c7 c7 b8 80 39 c0 e8 94 fa d4 c7 48 8b 93 d0 00 00 00 48 8b 83 d8 00 00 00 48 c7 c7 f0 90 39 c0 <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 83 d0 00 RSP: 0018:ffffac4aa059f688 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff9dcd1b214d00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff9dcd1fa165f8 RDI: ffffffffc03990f0 RBP: ffff9dccf9c7af80 R08: 0000000000000a3b R09: 0000000000000000 R10: ffff9dccfa11f420 R11: 0000000000000000 R12: 0000000000000001 R13: ffff9dcd16b433c0 R14: ffff9dcd1b214d80 R15: 0000000000000000 FS: 00007f441bfff700(0000) GS:ffff9dcd1fa00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000839e64004 CR4: 00000000001606e0 Call Trace: tcf_action_cleanup+0x59/0xca __tcf_action_put+0x54/0x6b __tcf_idr_release.cold.33+0x9/0x12 tcf_mirred_init.cold.20+0x22e/0x3b0 [act_mirred] tcf_action_init_1+0x3d0/0x4c0 tcf_action_init+0x9c/0x130 tcf_exts_validate+0xab/0xc0 fl_change+0x1ca/0x982 [cls_flower] tc_new_tfilter+0x647/0x8d0 ? load_balance+0x14b/0x9e0 rtnetlink_rcv_msg+0xe3/0x370 ? __switch_to_asm+0x40/0x70 ? __switch_to_asm+0x34/0x70 ? _cond_resched+0x15/0x30 ? __kmalloc_node_track_caller+0x1d4/0x2b0 ? rtnl_calcit.isra.31+0xf0/0xf0 netlink_rcv_skb+0x49/0x110 netlink_unicast+0x16f/0x210 netlink_sendmsg+0x1df/0x390 sock_sendmsg+0x36/0x40 ___sys_sendmsg+0x27b/0x2c0 ? futex_wake+0x80/0x140 ? do_futex+0x2b9/0xac0 ? ep_scan_ready_list.constprop.22+0x1f2/0x210 ? ep_poll+0x7a/0x430 __sys_sendmsg+0x47/0x80 do_syscall_64+0x55/0x100 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: 4e232818bd32 ("net: sched: act_mirred: remove dependency on rtnl lock") Signed-off-by: John Hurley Reviewed-by: Jakub Kicinski Acked-by: Cong Wang Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/sched/act_mirred.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/sched/act_mirred.c +++ b/net/sched/act_mirred.c @@ -159,6 +159,9 @@ static int tcf_mirred_init(struct net *n } m = to_mirred(*a); + if (ret == ACT_P_CREATED) + INIT_LIST_HEAD(&m->tcfm_list); + spin_lock_bh(&m->tcf_lock); m->tcf_action = parm->action; m->tcfm_eaction = parm->eaction;