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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6C73EC47DAF for ; Mon, 22 Jan 2024 15:27:51 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4TJYxy0Zr4z3by8 for ; Tue, 23 Jan 2024 02:27:50 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.alibaba.com (client-ip=115.124.30.124; helo=out30-124.freemail.mail.aliyun.com; envelope-from=hsiangkao@linux.alibaba.com; receiver=lists.ozlabs.org) Received: from out30-124.freemail.mail.aliyun.com (out30-124.freemail.mail.aliyun.com [115.124.30.124]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4TJYxr3DPkz3bmN for ; Tue, 23 Jan 2024 02:27:42 +1100 (AEDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R411e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046056;MF=hsiangkao@linux.alibaba.com;NM=1;PH=DS;RN=19;SR=0;TI=SMTPD_---0W.9olfy_1705937254; Received: from 30.25.251.50(mailfrom:hsiangkao@linux.alibaba.com fp:SMTPD_---0W.9olfy_1705937254) by smtp.aliyun-inc.com; Mon, 22 Jan 2024 23:27:37 +0800 Message-ID: Date: Mon, 22 Jan 2024 23:27:34 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 06/10] cachefiles, erofs: Fix NULL deref in when cachefiles is not doing ondemand-mode To: David Howells , Christian Brauner References: <20240122123845.3822570-1-dhowells@redhat.com> <20240122123845.3822570-7-dhowells@redhat.com> From: Gao Xiang In-Reply-To: <20240122123845.3822570-7-dhowells@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: linux-erofs@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development of Linux EROFS file system List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, v9fs@lists.linux.dev, Jeff Layton , linux-kernel@vger.kernel.org, Matthew Wilcox , linux-mm@kvack.org, Yue Hu , linux-fsdevel@vger.kernel.org, netfs@lists.linux.dev, ceph-devel@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-afs@lists.infradead.org, Marc Dionne Errors-To: linux-erofs-bounces+linux-erofs=archiver.kernel.org@lists.ozlabs.org Sender: "Linux-erofs" On 2024/1/22 20:38, David Howells wrote: > cachefiles_ondemand_init_object() as called from cachefiles_open_file() and > cachefiles_create_tmpfile() does not check if object->ondemand is set > before dereferencing it, leading to an oops something like: > > RIP: 0010:cachefiles_ondemand_init_object+0x9/0x41 > ... > Call Trace: > > cachefiles_open_file+0xc9/0x187 > cachefiles_lookup_cookie+0x122/0x2be > fscache_cookie_state_machine+0xbe/0x32b > fscache_cookie_worker+0x1f/0x2d > process_one_work+0x136/0x208 > process_scheduled_works+0x3a/0x41 > worker_thread+0x1a2/0x1f6 > kthread+0xca/0xd2 > ret_from_fork+0x21/0x33 > > Fix this by making the calls to cachefiles_ondemand_init_object() > conditional. > > Fixes: 3c5ecfe16e76 ("cachefiles: extract ondemand info field from cachefiles_object") > Reported-by: Marc Dionne > Signed-off-by: David Howells > cc: Gao Xiang > cc: Chao Yu > cc: Yue Hu > cc: Jeffle Xu > cc: linux-erofs@lists.ozlabs.org > cc: netfs@lists.linux.dev > cc: linux-fsdevel@vger.kernel.org Looks good to me, thanks for fixing this: Reviewed-by: Gao Xiang Thanks, Gao Xiang