From patchwork Thu Jun 1 20:58:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rishabh Bhatnagar X-Patchwork-Id: 13264422 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 5A18AC77B7A for ; Thu, 1 Jun 2023 20:58:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232635AbjFAU6d (ORCPT ); Thu, 1 Jun 2023 16:58:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229693AbjFAU6c (ORCPT ); Thu, 1 Jun 2023 16:58:32 -0400 Received: from smtp-fw-80009.amazon.com (smtp-fw-80009.amazon.com [99.78.197.220]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 550ADB3; Thu, 1 Jun 2023 13:58:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1685653111; x=1717189111; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=0//iUfwElF6+Ol5SZRiYFlOIxvlZ/qXnBBIyuRbnzNg=; b=MnPQiEPjqAJ+nbgcNruMDa6ww83bE66OseZF9QEnLO25R6jVymwZ+FMX 1U9IL5kdJ0pREJW5UKlwx+Bipuw5iluyZDNjefzwSMZxJCTci1Irdt73y qyjcRJJcAzW44g9u3CMOrsRKZrzQ8fx+jiorSTwTEfdQ/qu89kUwj5r13 I=; X-IronPort-AV: E=Sophos;i="6.00,210,1681171200"; d="scan'208";a="7512814" Received: from pdx4-co-svc-p1-lb2-vlan3.amazon.com (HELO email-inbound-relay-pdx-2a-m6i4x-8a14c045.us-west-2.amazon.com) ([10.25.36.214]) by smtp-border-fw-80009.pdx80.corp.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jun 2023 20:58:31 +0000 Received: from EX19MTAUWC002.ant.amazon.com (pdx1-ws-svc-p6-lb9-vlan2.pdx.amazon.com [10.236.137.194]) by email-inbound-relay-pdx-2a-m6i4x-8a14c045.us-west-2.amazon.com (Postfix) with ESMTPS id B85D68B58C; Thu, 1 Jun 2023 20:58:30 +0000 (UTC) Received: from EX19D002UWC001.ant.amazon.com (10.13.138.148) by EX19MTAUWC002.ant.amazon.com (10.250.64.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Thu, 1 Jun 2023 20:58:30 +0000 Received: from EX19MTAUWC001.ant.amazon.com (10.250.64.145) by EX19D002UWC001.ant.amazon.com (10.13.138.148) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Thu, 1 Jun 2023 20:58:30 +0000 Received: from dev-dsk-risbhat-2b-8bdc64cd.us-west-2.amazon.com (10.189.73.169) by mail-relay.amazon.com (10.250.64.145) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Thu, 1 Jun 2023 20:58:30 +0000 Received: by dev-dsk-risbhat-2b-8bdc64cd.us-west-2.amazon.com (Postfix, from userid 22673075) id 4D47EE6E; Thu, 1 Jun 2023 20:58:30 +0000 (UTC) From: Rishabh Bhatnagar To: , CC: , , , Rishabh Bhatnagar Subject: [PATCH 5.4 0/2] Backport few dfs related fixes to cifs Date: Thu, 1 Jun 2023 20:58:15 +0000 Message-ID: <20230601205817.3957-1-risbhat@amazon.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Recently we have been seeing kernel panic in cifs_reconnect function while accessing tgt_list. Looks like tgt_list is not initialized correctly. There are fixes already present in 5.10 and later trees. Backporting them to 5.4 CIFS VFS: \\172.30.1.14 cifs_reconnect: no target servers for DFS failover BUG: unable to handle page fault for address: fffffffffffffff8 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 260e067 P4D 260e067 PUD 2610067 PMD 0 Oops: 0000 [#1] SMP PTI RIP: 0010:cifs_reconnect+0x51d/0xef0 [cifs] RSP: 0018:ffffc90000693da0 EFLAGS: 00010282 RAX: fffffffffffffff8 RBX: ffff8887fa63b800 RCX: fffffffffffffff8 Call Trace: cifs_handle_standard+0x18d/0x1b0 [cifs] cifs_demultiplex_thread+0xa5c/0xc90 [cifs] kthread+0x113/0x130 Paulo Alcantara (2): cifs: get rid of unused parameter in reconn_setup_dfs_targets() cifs: handle empty list of targets in cifs_reconnect() fs/cifs/connect.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-)