From patchwork Tue Jan 17 00:09:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paulo Alcantara X-Patchwork-Id: 13104006 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 603D6C67871 for ; Tue, 17 Jan 2023 00:11:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232712AbjAQALB (ORCPT ); Mon, 16 Jan 2023 19:11:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233461AbjAQALA (ORCPT ); Mon, 16 Jan 2023 19:11:00 -0500 Received: from mx.cjr.nz (mx.cjr.nz [51.158.111.142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B02D54EF7 for ; Mon, 16 Jan 2023 16:10:58 -0800 (PST) Received: from authenticated-user (mx.cjr.nz [51.158.111.142]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: pc) by mx.cjr.nz (Postfix) with ESMTPSA id D6FC980268; Tue, 17 Jan 2023 00:10:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cjr.nz; s=dkim; t=1673914257; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5+axe9MxvuWApoHIx+qWh9J5EHP57rnmfzB+bezSWo4=; b=NyF4jOUvcSjABHzmNN1RKbj2zboRZvHogfjCELxoqIGOQY7aBul4vU4pG+78WHQIDS6azq /MHTyNIMm69SCJlfVqbe5AFiXRuevCF7ovv8Nio9IfDodof9HAf/AsEXGxE/avUOycFcT+ q1fTrD2lYYIk1VUkuXKs0bWTgpGIoUqE6o4hZafTHqPd4jjRjjlz2HAurYM0CQA+Bc82L1 7A0bqhBcTf2Z0t/W13wDsW6hRqVEjaNrYdn1vkWqmwqVv3n76j23t426rkBTJVB0WbCOW2 8PJOE7M6RaYr4DJPNcMkp4sfBofJoBi33gqhLgRwPRMwAWI/czh9x6TGzx1Vew== From: Paulo Alcantara To: smfrench@gmail.com Cc: linux-cifs@vger.kernel.org, Paulo Alcantara Subject: [PATCH 1/5] cifs: fix potential deadlock in cache_refresh_path() Date: Mon, 16 Jan 2023 21:09:48 -0300 Message-Id: <20230117000952.9965-2-pc@cjr.nz> In-Reply-To: <20230117000952.9965-1-pc@cjr.nz> References: <20230117000952.9965-1-pc@cjr.nz> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Avoid getting DFS referral from an exclusive lock in cache_refresh_path() because the tcon IPC used for getting the referral could be disconnected and thus causing a deadlock as shown below: task A ------ cifs_demultiplex_thread() cifs_handle_standard() reconnect_dfs_server() dfs_cache_noreq_find() down_read() task B ------ dfs_cache_find() cache_refresh_path() down_write() get_dfs_referral() smb2_get_dfs_refer() SMB2_ioctl() cifs_send_recv() compound_send_recv() wait_for_response() where task A cannot wake up task B because it is blocked due to the exclusive lock held in cache_refresh_path(). Fixes: c9f711039905 ("cifs: keep referral server sessions alive") Signed-off-by: Paulo Alcantara (SUSE) --- fs/cifs/dfs_cache.c | 37 ++++++++++++++++++------------------- 1 file changed, 18 insertions(+), 19 deletions(-) diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c index e20f8880363f..a8ddac1c054c 100644 --- a/fs/cifs/dfs_cache.c +++ b/fs/cifs/dfs_cache.c @@ -770,46 +770,45 @@ static int get_dfs_referral(const unsigned int xid, struct cifs_ses *ses, const */ static int cache_refresh_path(const unsigned int xid, struct cifs_ses *ses, const char *path) { - int rc; - struct cache_entry *ce; struct dfs_info3_param *refs = NULL; + struct cache_entry *ce; int numrefs = 0; - bool newent = false; + int rc; cifs_dbg(FYI, "%s: search path: %s\n", __func__, path); - down_write(&htable_rw_lock); + down_read(&htable_rw_lock); ce = lookup_cache_entry(path); - if (!IS_ERR(ce)) { - if (!cache_entry_expired(ce)) { - dump_ce(ce); - up_write(&htable_rw_lock); - return 0; - } - } else { - newent = true; + if (!IS_ERR(ce) && !cache_entry_expired(ce)) { + up_read(&htable_rw_lock); + return 0; } + up_read(&htable_rw_lock); + /* * Either the entry was not found, or it is expired. * Request a new DFS referral in order to create or update a cache entry. */ rc = get_dfs_referral(xid, ses, path, &refs, &numrefs); if (rc) - goto out_unlock; + goto out; dump_refs(refs, numrefs); - if (!newent) { - rc = update_cache_entry_locked(ce, refs, numrefs); - goto out_unlock; + down_write(&htable_rw_lock); + /* Re-check as another task might have it added or refreshed already */ + ce = lookup_cache_entry(path); + if (!IS_ERR(ce)) { + if (cache_entry_expired(ce)) + rc = update_cache_entry_locked(ce, refs, numrefs); + } else { + rc = add_cache_entry_locked(refs, numrefs); } - rc = add_cache_entry_locked(refs, numrefs); - -out_unlock: up_write(&htable_rw_lock); +out: free_dfs_info_array(refs, numrefs); return rc; }