From patchwork Tue Mar 31 08:58:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 228551 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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 5371DC2D0EE for ; Tue, 31 Mar 2020 09:22:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1EB7120658 for ; Tue, 31 Mar 2020 09:22:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585646574; bh=AlHW95CssIqsx8U4u/AbjdIfdvzK5ovjHTD8W6WJLuM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=vNvjQKOGMQReaRsvauQDcZv6N+he4Mn+roZr2Cx6E15PinPW2ORIeXpCw79RQV15G V9Ebd2RegVUOmxGiJ1C2Xd16lIDCVqpys08Q5yaJapsfRIqpckwFImTxAmmuZuMvZf JW5HweXSSKnw23wduNQvL21Zy3Eyp1m8uXaXiauQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730485AbgCaJFW (ORCPT ); Tue, 31 Mar 2020 05:05:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:46196 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730470AbgCaJFT (ORCPT ); Tue, 31 Mar 2020 05:05:19 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 DC46F20787; Tue, 31 Mar 2020 09:05:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585645518; bh=AlHW95CssIqsx8U4u/AbjdIfdvzK5ovjHTD8W6WJLuM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l3jwnaK1dSiu2dY5JvnJP4ptG0sAr5YqdoHH7ZUKQkrM+w3nuEYB9+UGjOup5SCIO bgIs6SRLoR74qACuTVckfO5TN0fa+17i9GxJXWUrGFeI8ZyXo2AkaAyR5U52eZU7Zn xuH6mzo1EssMcncDStK1Wl82oxwbeRPeojxLjTUg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dominik Czarnota , "David S. Miller" , Sasha Levin Subject: [PATCH 5.5 078/170] sxgbe: Fix off by one in samsung driver strncpy size arg Date: Tue, 31 Mar 2020 10:58:12 +0200 Message-Id: <20200331085432.618157886@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200331085423.990189598@linuxfoundation.org> References: <20200331085423.990189598@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dominik Czarnota [ Upstream commit f3cc008bf6d59b8d93b4190e01d3e557b0040e15 ] This patch fixes an off-by-one error in strncpy size argument in drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c. The issue is that in: strncmp(opt, "eee_timer:", 6) the passed string literal: "eee_timer:" has 10 bytes (without the NULL byte) and the passed size argument is 6. As a result, the logic will also accept other, malformed strings, e.g. "eee_tiXXX:". This bug doesn't seem to have any security impact since its present in module's cmdline parsing code. Signed-off-by: Dominik Czarnota Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c index 52ed111d98f4d..15e3f668218b1 100644 --- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c +++ b/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c @@ -2279,7 +2279,7 @@ static int __init sxgbe_cmdline_opt(char *str) if (!str || !*str) return -EINVAL; while ((opt = strsep(&str, ",")) != NULL) { - if (!strncmp(opt, "eee_timer:", 6)) { + if (!strncmp(opt, "eee_timer:", 10)) { if (kstrtoint(opt + 10, 0, &eee_timer)) goto err; }