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 B0950C6FA8E for ; Mon, 19 Sep 2022 23:09:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229932AbiISXJL (ORCPT ); Mon, 19 Sep 2022 19:09:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58112 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229911AbiISXJH (ORCPT ); Mon, 19 Sep 2022 19:09:07 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4AAE44DF16 for ; Mon, 19 Sep 2022 16:09:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1663628944; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8XtIN7tYHuR/gYIs8LpFfK7Y/fF2eBAeB7zp3qSwwc0=; b=EF0NylvYuMCCuLq36lXDqx853Ovq4cz722eOcnlM+GABDhEdYQlYOrQkeXBL5EJpkrp1ld Szjc2bzcu14imPDba9TPlUTAGM6ROBq/kOMRP/SOAwZSHYmhpKcRF/3K12Ta1BrOW7MZVW GLjn7XJK+nLT2dd+LaJDwszEEwNdl4M= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-182-AWcPVcKfMOCOhqVtIW1cEw-1; Mon, 19 Sep 2022 19:08:59 -0400 X-MC-Unique: AWcPVcKfMOCOhqVtIW1cEw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C3A41185A78F; Mon, 19 Sep 2022 23:08:58 +0000 (UTC) Received: from jtoppins.rdu.csb (unknown [10.22.8.155]) by smtp.corp.redhat.com (Postfix) with ESMTP id 608E2140EBF3; Mon, 19 Sep 2022 23:08:58 +0000 (UTC) From: Jonathan Toppins To: "netdev @ vger . kernel . org" Cc: Jay Vosburgh , Veaceslav Falico , Andy Gospodarek , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jussi Maki , linux-kernel@vger.kernel.org Subject: [PATCH net 2/2] bonding: fix NULL deref in bond_rr_gen_slave_id Date: Mon, 19 Sep 2022 19:08:46 -0400 Message-Id: <3cd65bdf26ba7b64c8ade801820562c426b90109.1663628505.git.jtoppins@redhat.com> In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Fix a NULL dereference of the struct bonding.rr_tx_counter member because if a bond is initially created with an initial mode != zero (Round Robin) the memory required for the counter is never created and when the mode is changed there is never any attempt to verify the memory is allocated upon switching modes. This causes the following Oops on an aarch64 machine: [ 334.686773] Unable to handle kernel paging request at virtual address ffff2c91ac905000 [ 334.694703] Mem abort info: [ 334.697486] ESR = 0x0000000096000004 [ 334.701234] EC = 0x25: DABT (current EL), IL = 32 bits [ 334.706536] SET = 0, FnV = 0 [ 334.709579] EA = 0, S1PTW = 0 [ 334.712719] FSC = 0x04: level 0 translation fault [ 334.717586] Data abort info: [ 334.720454] ISV = 0, ISS = 0x00000004 [ 334.724288] CM = 0, WnR = 0 [ 334.727244] swapper pgtable: 4k pages, 48-bit VAs, pgdp=000008044d662000 [ 334.733944] [ffff2c91ac905000] pgd=0000000000000000, p4d=0000000000000000 [ 334.740734] Internal error: Oops: 96000004 [#1] SMP [ 334.745602] Modules linked in: bonding tls veth rfkill sunrpc arm_spe_pmu vfat fat acpi_ipmi ipmi_ssif ixgbe igb i40e mdio ipmi_devintf ipmi_msghandler arm_cmn arm_dsu_pmu cppc_cpufreq acpi_tad fuse zram crct10dif_ce ast ghash_ce sbsa_gwdt nvme drm_vram_helper drm_ttm_helper nvme_core ttm xgene_hwmon [ 334.772217] CPU: 7 PID: 2214 Comm: ping Not tainted 6.0.0-rc4-00133-g64ae13ed4784 #4 [ 334.779950] Hardware name: GIGABYTE R272-P31-00/MP32-AR1-00, BIOS F18v (SCP: 1.08.20211002) 12/01/2021 [ 334.789244] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 334.796196] pc : bond_rr_gen_slave_id+0x40/0x124 [bonding] [ 334.801691] lr : bond_xmit_roundrobin_slave_get+0x38/0xdc [bonding] [ 334.807962] sp : ffff8000221733e0 [ 334.811265] x29: ffff8000221733e0 x28: ffffdbac8572d198 x27: ffff80002217357c [ 334.818392] x26: 000000000000002a x25: ffffdbacb33ee000 x24: ffff07ff980fa000 [ 334.825519] x23: ffffdbacb2e398ba x22: ffff07ff98102000 x21: ffff07ff981029c0 [ 334.832646] x20: 0000000000000001 x19: ffff07ff981029c0 x18: 0000000000000014 [ 334.839773] x17: 0000000000000000 x16: ffffdbacb1004364 x15: 0000aaaabe2f5a62 [ 334.846899] x14: ffff07ff8e55d968 x13: ffff07ff8e55db30 x12: 0000000000000000 [ 334.854026] x11: ffffdbacb21532e8 x10: 0000000000000001 x9 : ffffdbac857178ec [ 334.861153] x8 : ffff07ff9f6e5a28 x7 : 0000000000000000 x6 : 000000007c2b3742 [ 334.868279] x5 : ffff2c91ac905000 x4 : ffff2c91ac905000 x3 : ffff07ff9f554400 [ 334.875406] x2 : ffff2c91ac905000 x1 : 0000000000000001 x0 : ffff07ff981029c0 [ 334.882532] Call trace: [ 334.884967] bond_rr_gen_slave_id+0x40/0x124 [bonding] [ 334.890109] bond_xmit_roundrobin_slave_get+0x38/0xdc [bonding] [ 334.896033] __bond_start_xmit+0x128/0x3a0 [bonding] [ 334.901001] bond_start_xmit+0x54/0xb0 [bonding] [ 334.905622] dev_hard_start_xmit+0xb4/0x220 [ 334.909798] __dev_queue_xmit+0x1a0/0x720 [ 334.913799] arp_xmit+0x3c/0xbc [ 334.916932] arp_send_dst+0x98/0xd0 [ 334.920410] arp_solicit+0xe8/0x230 [ 334.923888] neigh_probe+0x60/0xb0 [ 334.927279] __neigh_event_send+0x3b0/0x470 [ 334.931453] neigh_resolve_output+0x70/0x90 [ 334.935626] ip_finish_output2+0x158/0x514 [ 334.939714] __ip_finish_output+0xac/0x1a4 [ 334.943800] ip_finish_output+0x40/0xfc [ 334.947626] ip_output+0xf8/0x1a4 [ 334.950931] ip_send_skb+0x5c/0x100 [ 334.954410] ip_push_pending_frames+0x3c/0x60 [ 334.958758] raw_sendmsg+0x458/0x6d0 [ 334.962325] inet_sendmsg+0x50/0x80 [ 334.965805] sock_sendmsg+0x60/0x6c [ 334.969286] __sys_sendto+0xc8/0x134 [ 334.972853] __arm64_sys_sendto+0x34/0x4c [ 334.976854] invoke_syscall+0x78/0x100 [ 334.980594] el0_svc_common.constprop.0+0x4c/0xf4 [ 334.985287] do_el0_svc+0x38/0x4c [ 334.988591] el0_svc+0x34/0x10c [ 334.991724] el0t_64_sync_handler+0x11c/0x150 [ 334.996072] el0t_64_sync+0x190/0x194 [ 334.999726] Code: b9001062 f9403c02 d53cd044 8b040042 (b8210040) [ 335.005810] ---[ end trace 0000000000000000 ]--- [ 335.010416] Kernel panic - not syncing: Oops: Fatal exception in interrupt [ 335.017279] SMP: stopping secondary CPUs [ 335.021374] Kernel Offset: 0x5baca8eb0000 from 0xffff800008000000 [ 335.027456] PHYS_OFFSET: 0x80000000 [ 335.030932] CPU features: 0x0000,0085c029,19805c82 [ 335.035713] Memory Limit: none [ 335.038756] Rebooting in 180 seconds.. The is to allocate the memory in bond_open() which is guaranteed to be called before any packets are processed. Fixes: 848ca9182a7d ("net: bonding: Use per-cpu rr_tx_counter") Signed-off-by: Jonathan Toppins --- drivers/net/bonding/bond_main.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index bc6d8b0aa6fb..86d42306aa5e 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -4182,6 +4182,12 @@ static int bond_open(struct net_device *bond_dev) struct list_head *iter; struct slave *slave; + if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) { + bond->rr_tx_counter = alloc_percpu(u32); + if (!bond->rr_tx_counter) + return -ENOMEM; + } + /* reset slave->backup and slave->inactive */ if (bond_has_slaves(bond)) { bond_for_each_slave(bond, slave, iter) { @@ -6243,15 +6249,6 @@ static int bond_init(struct net_device *bond_dev) if (!bond->wq) return -ENOMEM; - if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN) { - bond->rr_tx_counter = alloc_percpu(u32); - if (!bond->rr_tx_counter) { - destroy_workqueue(bond->wq); - bond->wq = NULL; - return -ENOMEM; - } - } - spin_lock_init(&bond->stats_lock); netdev_lockdep_set_classes(bond_dev); -- 2.31.1