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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 63998C282CE for ; Wed, 24 Apr 2019 17:57:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2523421773 for ; Wed, 24 Apr 2019 17:57:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556128656; bh=k9BLzuJwQ5Xa5RfoGP+O1cfgXNLaWA3XlZEzvq1cypA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GtndL5lJ9F5ht4G+Rykcp7mP6mj4oNDZw8g901ZIGiUOPjoiECm6BOGNmmgYsw90J e+rB987VHT2CmA31riDdY5W5QKfV2QagY6tR4yTKd3kVwB/TA+hcC3G04U0ojhptSH CAWvdz7xnBfHQlOivzAsfQM0zb6cuHPaKd34mTO4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390114AbfDXRZx (ORCPT ); Wed, 24 Apr 2019 13:25:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:51800 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390103AbfDXRZt (ORCPT ); Wed, 24 Apr 2019 13:25:49 -0400 Received: from localhost (62-193-50-229.as16211.net [62.193.50.229]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8771020835; Wed, 24 Apr 2019 17:25:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556126749; bh=k9BLzuJwQ5Xa5RfoGP+O1cfgXNLaWA3XlZEzvq1cypA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q0atkYX4So8FapSh9daXdmX33S5tW8nAMdxePPCofDMiwtt1at5wpySK+cTaZRvdO BkPaQlmOE1DaX7uIi1rmUCj6HHGO51JqQGWelthIKuZGQDNlaOAGBp2DGGj3VWzYEp z0MvfH3dDGtf+/NtBSl16R9HK6/D3bKC2zYdFkCs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+d21e6e297322a900c128@syzkaller.appspotmail.com, Jason Wang , "Michael S. Tsirkin" , "David S. Miller" Subject: [PATCH 4.9 08/44] vhost: reject zero size iova range Date: Wed, 24 Apr 2019 19:09:46 +0200 Message-Id: <20190424170846.045701214@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190424170839.924291114@linuxfoundation.org> References: <20190424170839.924291114@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jason Wang [ Upstream commit 813dbeb656d6c90266f251d8bd2b02d445afa63f ] We used to accept zero size iova range which will lead a infinite loop in translate_desc(). Fixing this by failing the request in this case. Reported-by: syzbot+d21e6e297322a900c128@syzkaller.appspotmail.com Fixes: 6b1e6cc7 ("vhost: new device IOTLB API") Signed-off-by: Jason Wang Acked-by: Michael S. Tsirkin Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/vhost/vhost.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -863,8 +863,12 @@ static int vhost_new_umem_range(struct v u64 start, u64 size, u64 end, u64 userspace_addr, int perm) { - struct vhost_umem_node *tmp, *node = kmalloc(sizeof(*node), GFP_ATOMIC); + struct vhost_umem_node *tmp, *node; + if (!size) + return -EFAULT; + + node = kmalloc(sizeof(*node), GFP_ATOMIC); if (!node) return -ENOMEM;