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,URIBL_BLOCKED,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 120CFC38A2F for ; Sat, 18 Apr 2020 14:48:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA2392072B for ; Sat, 18 Apr 2020 14:48:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587221303; bh=5Gb4NGTfkx9h26Nx0aaiJNVgu0YKJnRYpcXYM3gzJnU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=b5eCJVTpNwwo0blPIzb+tM2ghXk4KwWb5Di/d+AloKg9A3jdWlnWP51sVwXBWfgs/ +1moh3jGK4Y5IgWh3YoQTOmtXmgds6ZK3V0HZdc327OGC74sXfJ0t44kAL8D8emKX9 +0D0GyVblMvWrp2SIMbPZtIPz2jyV786uzWWM5ks= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728737AbgDROsX (ORCPT ); Sat, 18 Apr 2020 10:48:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:55274 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728694AbgDROny (ORCPT ); Sat, 18 Apr 2020 10:43:54 -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 DCD6C21D79; Sat, 18 Apr 2020 14:43:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587221034; bh=5Gb4NGTfkx9h26Nx0aaiJNVgu0YKJnRYpcXYM3gzJnU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NLFWtlkKYpWCZ//SOEDP2RLk66zToiLsoY8Evh9FXPkb5X7YN+hk0p+KL68ZZ67mK WEsRXZamGMSkCz2XKY9hkSEaSGetTJyoBVbaRUc4pCFs8iFKTRm5JQvpmXIpaIlFnN EJwfTjNdyWKeTFV4evpvOPoW+BUUyEzQNhsWmJMk= 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 4.14 20/28] libnvdimm: Out of bounds read in __nd_ioctl() Date: Sat, 18 Apr 2020 10:43:20 -0400 Message-Id: <20200418144328.10265-20-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200418144328.10265-1-sashal@kernel.org> References: <20200418144328.10265-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 2f1b54fab399f..83e18b367944c 100644 --- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -951,8 +951,10 @@ 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