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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 3E954C2BA19 for ; Wed, 15 Apr 2020 12:08:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 117F5206A2 for ; Wed, 15 Apr 2020 12:08:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586952498; bh=g+/DlI/neXXLGTI4GaNTz0Xd8LaLWlzfFIRyTD5ifOs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SfmM69ndgKokY333Z9ljVOe9kiKqpf2MKBwokxJu2lt1mhj7BYdk6iVvz6ztvdlPU lNFx4Vj148sANfglayjBvR3a6YlmVgJ7he0skf/F+kA4YFxAMrU25zg3LVJPWl7vdX EcVJbaCHyJNz/VHBCvOdAtMSYzseW21fL5PZBGYI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2441255AbgDOMIP (ORCPT ); Wed, 15 Apr 2020 08:08:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:42374 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2897604AbgDOLrI (ORCPT ); Wed, 15 Apr 2020 07:47:08 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3B2F8214D8; Wed, 15 Apr 2020 11:47:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586951227; bh=g+/DlI/neXXLGTI4GaNTz0Xd8LaLWlzfFIRyTD5ifOs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z1PVdT/lRDdrUwa1GgVsZgEikGE5jyjJpujQENs5RqpkXyKQxtE2qJAEmcqrSv0J8 M2MAXeYjSW/8UhWUeoCknvfwxs5fP5icuhj9MwPZvyiFBfTHNdPIpOtTiswLM2UTSg B54FeWPv4TC9rGwrzuXkSKkCGsqPpKnvYbjYuEXM= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dan Carpenter , Dan Williams , Sasha Levin , linux-nvdimm@lists.01.org Subject: [PATCH AUTOSEL 4.19 38/40] libnvdimm: Out of bounds read in __nd_ioctl() Date: Wed, 15 Apr 2020 07:46:21 -0400 Message-Id: <20200415114623.14972-38-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200415114623.14972-1-sashal@kernel.org> References: <20200415114623.14972-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dan Carpenter [ Upstream commit f84afbdd3a9e5e10633695677b95422572f920dc ] The "cmd" comes from the user and it can be up to 255. It it's more than the number of bits in long, it results out of bounds read when we check test_bit(cmd, &cmd_mask). The highest valid value for "cmd" is ND_CMD_CALL (10) so I added a compare against that. Fixes: 62232e45f4a2 ("libnvdimm: control (ioctl) messages for nvdimm_bus and nvdimm devices") Signed-off-by: Dan Carpenter Link: https://lore.kernel.org/r/20200225162055.amtosfy7m35aivxg@kili.mountain Signed-off-by: Dan Williams Signed-off-by: Sasha Levin --- drivers/nvdimm/bus.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c index 54a633e8cb5d2..48a070a37ea9b 100644 --- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -984,8 +984,10 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, return -EFAULT; } - if (!desc || (desc->out_num + desc->in_num == 0) || - !test_bit(cmd, &cmd_mask)) + if (!desc || + (desc->out_num + desc->in_num == 0) || + cmd > ND_CMD_CALL || + !test_bit(cmd, &cmd_mask)) return -ENOTTY; /* fail write commands (when read-only) */ -- 2.20.1