From patchwork Mon Jan 22 12:38:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 765230 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0208E3DBBE for ; Mon, 22 Jan 2024 12:39:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705927154; cv=none; b=aHXiLGrvtQtj/t0HyL/zC0Lvx/XcP0KZZI5Q9NM11O3uc/YFvz2DxYNGfQ1oRwm7r8qKqln2o7KOU25I+/6bz182j4gxH3QEc67DISWE/W8GqgWhjw/USgzpjGosYZelr0dDVQ/0YGybIjJmY/FkLzobpGty61VJP2M8/0Vh6Yw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705927154; c=relaxed/simple; bh=8G3yBj9g+dso7iEfMFsKAhuhaGEPop9JL1MTx/cr1WY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jgNnvt3s5H1djVBSJLTmn3TKjd9H7ujmADguQB3Bz5/Og21U15BXpI815bhOT1NSCTYwPwCtA7SD8QK2if9pAHTUbCZxxXVHinqqWyBaf0Nv/4pO6vVCZSefDI6+t01o9lDS2gNd2M3uCmRY74HjHAaAUM1N+uhJvxApo1aK2VQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=T4RO/W+t; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="T4RO/W+t" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1705927152; 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=iici4CcialH0lyfTdSLWnoYWTya5IEpmfmLuwHkca5Y=; b=T4RO/W+tlHh/6oGzcEYvxXqe++IOJleYxhKelCSF0jXgULfRSE8F0/WqJZCrJRNPA7MWB3 J3X8zm14XwzYNTHnHln2YTTQ4//15Y2TCxkUMjp47bW6HUjtZj4En3Ti2mzjiiskR/Ufz6 CQuNLK2SR/SNNu9GihSSJGeO+G4792k= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-304-nqfuXrHZNCS78rn85yiyNQ-1; Mon, 22 Jan 2024 07:39:09 -0500 X-MC-Unique: nqfuXrHZNCS78rn85yiyNQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (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 mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0A9D51C05ABA; Mon, 22 Jan 2024 12:39:08 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.42.28.67]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9CA3E2026D66; Mon, 22 Jan 2024 12:39:05 +0000 (UTC) From: David Howells To: Christian Brauner Cc: David Howells , Jeff Layton , Matthew Wilcox , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Marc Dionne , Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu Subject: [PATCH 06/10] cachefiles, erofs: Fix NULL deref in when cachefiles is not doing ondemand-mode Date: Mon, 22 Jan 2024 12:38:39 +0000 Message-ID: <20240122123845.3822570-7-dhowells@redhat.com> In-Reply-To: <20240122123845.3822570-1-dhowells@redhat.com> References: <20240122123845.3822570-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: ceph-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 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 --- fs/cachefiles/namei.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c index 7ade836beb58..180594d24c44 100644 --- a/fs/cachefiles/namei.c +++ b/fs/cachefiles/namei.c @@ -473,9 +473,11 @@ struct file *cachefiles_create_tmpfile(struct cachefiles_object *object) if (!cachefiles_mark_inode_in_use(object, file_inode(file))) WARN_ON(1); - ret = cachefiles_ondemand_init_object(object); - if (ret < 0) - goto err_unuse; + if (object->ondemand) { + ret = cachefiles_ondemand_init_object(object); + if (ret < 0) + goto err_unuse; + } ni_size = object->cookie->object_size; ni_size = round_up(ni_size, CACHEFILES_DIO_BLOCK_SIZE); @@ -579,9 +581,11 @@ static bool cachefiles_open_file(struct cachefiles_object *object, } _debug("file -> %pd positive", dentry); - ret = cachefiles_ondemand_init_object(object); - if (ret < 0) - goto error_fput; + if (object->ondemand) { + ret = cachefiles_ondemand_init_object(object); + if (ret < 0) + goto error_fput; + } ret = cachefiles_check_auxdata(object, file); if (ret < 0)