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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 177E6C433E0 for ; Mon, 1 Mar 2021 21:20:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CF68960249 for ; Mon, 1 Mar 2021 21:20:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244232AbhCAVSg (ORCPT ); Mon, 1 Mar 2021 16:18:36 -0500 Received: from mail.kernel.org ([198.145.29.99]:46226 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232046AbhCAROC (ORCPT ); Mon, 1 Mar 2021 12:14:02 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1372F65034; Mon, 1 Mar 2021 16:45:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614617109; bh=E244ZyM4FbGv/nvusqc4Wa3S0nONGOmFsZYqhti3Rms=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nJn9/qGyzmP3O/qZ2Za0Jk62bbAvVyaoMK/u/6ZMH+PShweSUlBALg3A1ngxIPxKo cJsVeaMU/42GQovzn6f2u3zUMc0+dK4BkBy0KAfkYMn2Zogs3k8JD+Ksi3OjW4fsFJ xTC5emvoA2j5R4ZG7wYFyZE2Y+zuDkvkdwwthcmk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+15ec7391f3d6a1a7cc7d@syzkaller.appspotmail.com, Sabyrzhan Tasbolatov Subject: [PATCH 4.19 206/247] drivers/misc/vmw_vmci: restrict too big queue size in qp_host_alloc_queue Date: Mon, 1 Mar 2021 17:13:46 +0100 Message-Id: <20210301161041.754746654@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161031.684018251@linuxfoundation.org> References: <20210301161031.684018251@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sabyrzhan Tasbolatov commit 2fd10bcf0310b9525b2af9e1f7aa9ddd87c3772e upstream. syzbot found WARNING in qp_broker_alloc[1] in qp_host_alloc_queue() when num_pages is 0x100001, giving queue_size + queue_page_size bigger than KMALLOC_MAX_SIZE for kzalloc(), resulting order >= MAX_ORDER condition. queue_size + queue_page_size=0x8000d8, where KMALLOC_MAX_SIZE=0x400000. [1] Call Trace: alloc_pages include/linux/gfp.h:547 [inline] kmalloc_order+0x40/0x130 mm/slab_common.c:837 kmalloc_order_trace+0x15/0x70 mm/slab_common.c:853 kmalloc_large include/linux/slab.h:481 [inline] __kmalloc+0x257/0x330 mm/slub.c:3959 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:682 [inline] qp_host_alloc_queue drivers/misc/vmw_vmci/vmci_queue_pair.c:540 [inline] qp_broker_create drivers/misc/vmw_vmci/vmci_queue_pair.c:1351 [inline] qp_broker_alloc+0x936/0x2740 drivers/misc/vmw_vmci/vmci_queue_pair.c:1739 Reported-by: syzbot+15ec7391f3d6a1a7cc7d@syzkaller.appspotmail.com Signed-off-by: Sabyrzhan Tasbolatov Link: https://lore.kernel.org/r/20210209102612.2112247-1-snovitoll@gmail.com Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/misc/vmw_vmci/vmci_queue_pair.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/misc/vmw_vmci/vmci_queue_pair.c +++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c @@ -552,6 +552,9 @@ static struct vmci_queue *qp_host_alloc_ queue_page_size = num_pages * sizeof(*queue->kernel_if->u.h.page); + if (queue_size + queue_page_size > KMALLOC_MAX_SIZE) + return NULL; + queue = kzalloc(queue_size + queue_page_size, GFP_KERNEL); if (queue) { queue->q_header = NULL;