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=-10.6 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=ham 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 49007C43387 for ; Mon, 7 Jan 2019 12:34:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 19DB52147C for ; Mon, 7 Jan 2019 12:34:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546864446; bh=J8kPKhkdjZxP526+ZWcTxR88dMiqS/bxql/wH69bMXM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=w3doxwMOexpgDONZVo7cOcZKlPLQM7/sqU7p7W1h10exvRDw3868FivR1uNzF6AQF 8F3E6RcSM+q0ysZVew4Mcgl2PrajB3xqlWLMePwUHCQ3rPfCTVzLeZaBYS/otXS1b4 QHUMToX7agL6fWQMHMyf5rm3nNGUhaRe4vTv1ZrI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727078AbfAGMeF (ORCPT ); Mon, 7 Jan 2019 07:34:05 -0500 Received: from mail.kernel.org ([198.145.29.99]:45662 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726667AbfAGMeC (ORCPT ); Mon, 7 Jan 2019 07:34:02 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 7B5E420859; Mon, 7 Jan 2019 12:34:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546864442; bh=J8kPKhkdjZxP526+ZWcTxR88dMiqS/bxql/wH69bMXM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=y/1wUg+l9xdXYTS4NyD86KU1bxehEfzFy3RCEGVO1ik3mDnzBoIZFP/8NB51jpjpx 1T0TTRnynr38nSEN8WkEzTSMNkFKwlZTiJ+fHPjculTDhnbR8PmL1HBowrNrIqzTyc JJKVCXjmVSU3RYA9yjQ5Yo5GKV3kkuIacYgYIP6k= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ivan Mironov , Sudarsana Kalluru , "David S. Miller" Subject: [PATCH 4.20 004/145] bnx2x: Fix NULL pointer dereference in bnx2x_del_all_vlans() on some hw Date: Mon, 7 Jan 2019 13:30:41 +0100 Message-Id: <20190107104437.873173296@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190107104437.308206189@linuxfoundation.org> References: <20190107104437.308206189@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 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ivan Mironov [ Upstream commit 38355a5f9a22bfa5bd5b1bb79805aca39fa53729 ] This happened when I tried to boot normal Fedora 29 system with latest available kernel (from fedora rawhide, plus some unrelated custom patches): BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 PGD 0 P4D 0 Oops: 0010 [#1] SMP PTI CPU: 6 PID: 1422 Comm: libvirtd Tainted: G I 4.20.0-0.rc7.git3.hpsa2.1.fc29.x86_64 #1 Hardware name: HP ProLiant BL460c G6, BIOS I24 05/21/2018 RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffffa47ccdc9fbe0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000000003e8 RCX: ffffa47ccdc9fbf8 RDX: ffffa47ccdc9fc00 RSI: ffff97d9ee7b01f8 RDI: ffff97d9f0150b80 RBP: ffff97d9f0150b80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003 R13: ffff97d9ef1e53e8 R14: 0000000000000009 R15: ffff97d9f0ac6730 FS: 00007f4d224ef700(0000) GS:ffff97d9fa200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000011ece52006 CR4: 00000000000206e0 Call Trace: ? bnx2x_chip_cleanup+0x195/0x610 [bnx2x] ? bnx2x_nic_unload+0x1e2/0x8f0 [bnx2x] ? bnx2x_reload_if_running+0x24/0x40 [bnx2x] ? bnx2x_set_features+0x79/0xa0 [bnx2x] ? __netdev_update_features+0x244/0x9e0 ? netlink_broadcast_filtered+0x136/0x4b0 ? netdev_update_features+0x22/0x60 ? dev_disable_lro+0x1c/0xe0 ? devinet_sysctl_forward+0x1c6/0x211 ? proc_sys_call_handler+0xab/0x100 ? __vfs_write+0x36/0x1a0 ? rcu_read_lock_sched_held+0x79/0x80 ? rcu_sync_lockdep_assert+0x2e/0x60 ? __sb_start_write+0x14c/0x1b0 ? vfs_write+0x159/0x1c0 ? vfs_write+0xba/0x1c0 ? ksys_write+0x52/0xc0 ? do_syscall_64+0x60/0x1f0 ? entry_SYSCALL_64_after_hwframe+0x49/0xbe After some investigation I figured out that recently added cleanup code tries to call VLAN filtering de-initialization function which exist only for newer hardware. Corresponding function pointer is not set (== 0) for older hardware, namely these chips: #define CHIP_NUM_57710 0x164e #define CHIP_NUM_57711 0x164f #define CHIP_NUM_57711E 0x1650 And I have one of those in my test system: Broadcom Inc. and subsidiaries NetXtreme II BCM57711E 10-Gigabit PCIe [14e4:1650] Function bnx2x_init_vlan_mac_fp_objs() from drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h decides whether to initialize relevant pointers in bnx2x_sp_objs.vlan_obj or not. This regression was introduced after v4.20-rc7, and still exists in v4.20 release. Fixes: 04f05230c5c13 ("bnx2x: Remove configured vlans as part of unload sequence.") Signed-off-by: Ivan Mironov Signed-off-by: Ivan Mironov Acked-by: Sudarsana Kalluru Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c @@ -9360,10 +9360,16 @@ void bnx2x_chip_cleanup(struct bnx2x *bp BNX2X_ERR("Failed to schedule DEL commands for UC MACs list: %d\n", rc); - /* Remove all currently configured VLANs */ - rc = bnx2x_del_all_vlans(bp); - if (rc < 0) - BNX2X_ERR("Failed to delete all VLANs\n"); + /* The whole *vlan_obj structure may be not initialized if VLAN + * filtering offload is not supported by hardware. Currently this is + * true for all hardware covered by CHIP_IS_E1x(). + */ + if (!CHIP_IS_E1x(bp)) { + /* Remove all currently configured VLANs */ + rc = bnx2x_del_all_vlans(bp); + if (rc < 0) + BNX2X_ERR("Failed to delete all VLANs\n"); + } /* Disable LLH */ if (!CHIP_IS_E1(bp))