Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE4C9C433F5 for ; Thu, 18 Nov 2021 03:02:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D26A76187F for ; Thu, 18 Nov 2021 03:02:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242595AbhKRDFy (ORCPT ); Wed, 17 Nov 2021 22:05:54 -0500 Received: from mailgw.kylinos.cn ([123.150.8.42]:11716 "EHLO nksmu.kylinos.cn" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S241265AbhKRDFt (ORCPT ); Wed, 17 Nov 2021 22:05:49 -0500 X-UUID: e2680b37e17d4c76ac7c9f6a70b2469f-20211118 X-UUID: e2680b37e17d4c76ac7c9f6a70b2469f-20211118 X-User: zhangyue1@kylinos.cn Received: from localhost.localdomain [(172.17.127.2)] by nksmu.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 828872036; Thu, 18 Nov 2021 11:11:20 +0800 From: zhangyue To: davem@davemloft.net, jesse.brandeburg@intel.com, gregkh@linuxfoundation.org, ecree@solarflare.com Cc: netdev@vger.kernel.org, linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] net: tulip: de4x5: fix the problem that the array 'lp->phy[8]' may be out of bound Date: Sun, 14 Nov 2021 05:29:21 +0800 Message-Id: <20211113212921.356392-1-zhangyue1@kylinos.cn> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In line 5001, if all id in the array 'lp->phy[8]' is not 0, when the 'for' end, the 'k' is 8. At this time, the array 'lp->phy[8]' may be out of bound. Signed-off-by: zhangyue --- drivers/net/ethernet/dec/tulip/de4x5.c | 30 +++++++++++++++----------- 1 file changed, 17 insertions(+), 13 deletions(-) diff --git a/drivers/net/ethernet/dec/tulip/de4x5.c b/drivers/net/ethernet/dec/tulip/de4x5.c index c813e6f2b371..a80252973171 100644 --- a/drivers/net/ethernet/dec/tulip/de4x5.c +++ b/drivers/net/ethernet/dec/tulip/de4x5.c @@ -4999,19 +4999,23 @@ mii_get_phy(struct net_device *dev) } if ((j == limit) && (i < DE4X5_MAX_MII)) { for (k=0; k < DE4X5_MAX_PHY && lp->phy[k].id; k++); - lp->phy[k].addr = i; - lp->phy[k].id = id; - lp->phy[k].spd.reg = GENERIC_REG; /* ANLPA register */ - lp->phy[k].spd.mask = GENERIC_MASK; /* 100Mb/s technologies */ - lp->phy[k].spd.value = GENERIC_VALUE; /* TX & T4, H/F Duplex */ - lp->mii_cnt++; - lp->active++; - printk("%s: Using generic MII device control. If the board doesn't operate,\nplease mail the following dump to the author:\n", dev->name); - j = de4x5_debug; - de4x5_debug |= DEBUG_MII; - de4x5_dbg_mii(dev, k); - de4x5_debug = j; - printk("\n"); + if (k < DE4X5_MAX_PHY) { + lp->phy[k].addr = i; + lp->phy[k].id = id; + lp->phy[k].spd.reg = GENERIC_REG; /* ANLPA register */ + lp->phy[k].spd.mask = GENERIC_MASK; /* 100Mb/s technologies */ + lp->phy[k].spd.value = GENERIC_VALUE; /* TX & T4, H/F Duplex */ + lp->mii_cnt++; + lp->active++; + printk("%s: Using generic MII device control. If the board doesn't operate,\nplease mail the following dump to the author:\n", dev->name); + j = de4x5_debug; + de4x5_debug |= DEBUG_MII; + de4x5_dbg_mii(dev, k); + de4x5_debug = j; + printk("\n"); + } else { + goto purgatory; + } } } purgatory: -- 2.30.0