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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 20C74C7618F for ; Wed, 24 Jul 2019 20:28:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E868E214AF for ; Wed, 24 Jul 2019 20:28:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564000083; bh=Y9Pq0EbIcsS7FR/8qWpRKOO8+pZQLtcLgHAYAnC7vw0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=MVtZVx8JAHAebg14vp7sRKpDd6UjfTNVIoIWJSLdUBp+5B1bhvxcWro+gEVLWua9I FUuMSAG6GwonEDxPHmiygo3AoiHNQLkOUoY8jFmJaHFa9UV8J8FY9ShAWbnX4dQWZ0 ugG82TfKMrjmOMQUTulo6fOw1/QdekC+yYIIAvZ8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389155AbfGXTfM (ORCPT ); Wed, 24 Jul 2019 15:35:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:58384 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389115AbfGXTfE (ORCPT ); Wed, 24 Jul 2019 15:35:04 -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 23B3622ADC; Wed, 24 Jul 2019 19:35:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563996903; bh=Y9Pq0EbIcsS7FR/8qWpRKOO8+pZQLtcLgHAYAnC7vw0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RBVvgXOmjIPVvlBuaYJKPVREO4xlqlpDmU7LYa5JQ6H4UoIJ5rq3raTkF8JS/JOSq iD8edH7i/eu7G8BD91L8AbU2hXAGL6XdpbLP7af9zkRcb+P7N4KqqXFv0dyVGJ26sb SzdJ8Uggq9UgBPsrsCtkoLkywOA5l5fEGBqHY+8A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Roopa Prabhu , Taehee Yoo , "David S. Miller" , Sasha Levin Subject: [PATCH 5.2 214/413] vxlan: do not destroy fdb if register_netdevice() is failed Date: Wed, 24 Jul 2019 21:18:25 +0200 Message-Id: <20190724191749.860604568@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190724191735.096702571@linuxfoundation.org> References: <20190724191735.096702571@linuxfoundation.org> User-Agent: quilt/0.66 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 [ Upstream commit 7c31e54aeee517d1318dfc0bde9fa7de75893dc6 ] __vxlan_dev_create() destroys FDB using specific pointer which indicates a fdb when error occurs. But that pointer should not be used when register_netdevice() fails because register_netdevice() internally destroys fdb when error occurs. This patch makes vxlan_fdb_create() to do not link fdb entry to vxlan dev internally. Instead, a new function vxlan_fdb_insert() is added to link fdb to vxlan dev. vxlan_fdb_insert() is called after calling register_netdevice(). This routine can avoid situation that ->ndo_uninit() destroys fdb entry in error path of register_netdevice(). Hence, error path of __vxlan_dev_create() routine can have an opportunity to destroy default fdb entry by hand. Test command ip link add bonding_masters type vxlan id 0 group 239.1.1.1 \ dev enp0s9 dstport 4789 Splat looks like: [ 213.392816] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 213.401257] general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI [ 213.402178] CPU: 0 PID: 1414 Comm: ip Not tainted 5.2.0-rc5+ #256 [ 213.402178] RIP: 0010:vxlan_fdb_destroy+0x120/0x220 [vxlan] [ 213.402178] Code: df 48 8b 2b 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 06 01 00 00 4c 8b 63 08 48 b8 00 00 00 00 00 fc d [ 213.402178] RSP: 0018:ffff88810cb9f0a0 EFLAGS: 00010202 [ 213.402178] RAX: dffffc0000000000 RBX: ffff888101d4a8c8 RCX: 0000000000000000 [ 213.402178] RDX: 1bd5a00000000040 RSI: ffff888101d4a8c8 RDI: ffff888101d4a8d0 [ 213.402178] RBP: 0000000000000000 R08: fffffbfff22b72d9 R09: 0000000000000000 [ 213.402178] R10: 00000000ffffffef R11: 0000000000000000 R12: dead000000000200 [ 213.402178] R13: ffff88810cb9f1f8 R14: ffff88810efccda0 R15: ffff88810efccda0 [ 213.402178] FS: 00007f7f6621a0c0(0000) GS:ffff88811b000000(0000) knlGS:0000000000000000 [ 213.402178] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 213.402178] CR2: 000055746f0807d0 CR3: 00000001123e0000 CR4: 00000000001006f0 [ 213.402178] Call Trace: [ 213.402178] __vxlan_dev_create+0x3a9/0x7d0 [vxlan] [ 213.402178] ? vxlan_changelink+0x740/0x740 [vxlan] [ 213.402178] ? rcu_read_unlock+0x60/0x60 [vxlan] [ 213.402178] ? __kasan_kmalloc.constprop.3+0xa0/0xd0 [ 213.402178] vxlan_newlink+0x8d/0xc0 [vxlan] [ 213.402178] ? __vxlan_dev_create+0x7d0/0x7d0 [vxlan] [ 213.554119] ? __netlink_ns_capable+0xc3/0xf0 [ 213.554119] __rtnl_newlink+0xb75/0x1180 [ 213.554119] ? rtnl_link_unregister+0x230/0x230 [ ... ] Fixes: 0241b836732f ("vxlan: fix default fdb entry netlink notify ordering during netdev create") Suggested-by: Roopa Prabhu Signed-off-by: Taehee Yoo Acked-by: Roopa Prabhu Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/vxlan.c | 37 +++++++++++++++++++++++++++---------- 1 file changed, 27 insertions(+), 10 deletions(-) diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index 083f3f0bf37f..b4283f52a09d 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -804,6 +804,14 @@ static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, return f; } +static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac, + __be32 src_vni, struct vxlan_fdb *f) +{ + ++vxlan->addrcnt; + hlist_add_head_rcu(&f->hlist, + vxlan_fdb_head(vxlan, mac, src_vni)); +} + static int vxlan_fdb_create(struct vxlan_dev *vxlan, const u8 *mac, union vxlan_addr *ip, __u16 state, __be16 port, __be32 src_vni, @@ -829,18 +837,13 @@ static int vxlan_fdb_create(struct vxlan_dev *vxlan, return rc; } - ++vxlan->addrcnt; - hlist_add_head_rcu(&f->hlist, - vxlan_fdb_head(vxlan, mac, src_vni)); - *fdb = f; return 0; } -static void vxlan_fdb_free(struct rcu_head *head) +static void __vxlan_fdb_free(struct vxlan_fdb *f) { - struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); struct vxlan_rdst *rd, *nd; list_for_each_entry_safe(rd, nd, &f->remotes, list) { @@ -850,6 +853,13 @@ static void vxlan_fdb_free(struct rcu_head *head) kfree(f); } +static void vxlan_fdb_free(struct rcu_head *head) +{ + struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); + + __vxlan_fdb_free(f); +} + static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, bool do_notify, bool swdev_notify) { @@ -977,6 +987,7 @@ static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, if (rc < 0) return rc; + vxlan_fdb_insert(vxlan, mac, src_vni, f); rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, swdev_notify, extack); if (rc) @@ -3571,12 +3582,17 @@ static int __vxlan_dev_create(struct net *net, struct net_device *dev, if (err) goto errout; - /* notify default fdb entry */ if (f) { + vxlan_fdb_insert(vxlan, all_zeros_mac, + vxlan->default_dst.remote_vni, f); + + /* notify default fdb entry */ err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, true, extack); - if (err) - goto errout; + if (err) { + vxlan_fdb_destroy(vxlan, f, false, false); + goto unregister; + } } list_add(&vxlan->next, &vn->vxlan_list); @@ -3588,7 +3604,8 @@ static int __vxlan_dev_create(struct net *net, struct net_device *dev, * destroy the entry by hand here. */ if (f) - vxlan_fdb_destroy(vxlan, f, false, false); + __vxlan_fdb_free(f); +unregister: if (unregister) unregister_netdevice(dev); return err; -- 2.20.1