From patchwork Tue May 14 12:34:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jia-Ju Bai X-Patchwork-Id: 1099462 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="Z7pnFkGA"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 453HFT5hywz9sMr for ; Tue, 14 May 2019 22:34:53 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726434AbfENMes (ORCPT ); Tue, 14 May 2019 08:34:48 -0400 Received: from mail-pg1-f196.google.com ([209.85.215.196]:35405 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725893AbfENMes (ORCPT ); Tue, 14 May 2019 08:34:48 -0400 Received: by mail-pg1-f196.google.com with SMTP id h1so8581691pgs.2; Tue, 14 May 2019 05:34:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=aGu1f+RrnUPQT+gHJR7zuBRu3GeHB/WJgEjaROthtGg=; b=Z7pnFkGAH2BlUDH3+FhIH0sOO38syFyZBNQ8mewx3bzSMfHIZauAYn7CRsxJ1BYS49 CcQHC7TjzP84vvbTkkmKHpbuPh7s5PrGgSZ9OAeY1R+helnNcLmQgRix200T8eD7tYi+ 0k2Vrgkb/yz4TyEoRv1oF+YJyeh4Z0pI2EKVe448kCeuyq/uFpR74wy6rPfMX8/Rcy9l rYLw+AZTi+CduC7I9ErJv6pZENbrXAPFHyVnkyF2PDSiKOI7F+/v5tHd+BNmkKAi0s3T ur4hi/kKaBRYzw2rBEnFiUkF+JDg2ECWXSHrNJ49YhM1bqFB7F9jkmgPYS0tKqxDKg5W vg+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=aGu1f+RrnUPQT+gHJR7zuBRu3GeHB/WJgEjaROthtGg=; b=OA8jpmaoTVLj3dn0NRpqWlQedB2+8pHeP3h7pEpXR+CV2BJU44zjmbLLtNETTZdYyV iZBNPLE+YV1HraB81hyhDfYUiD0zuYWzWMAEpdBdcUkG8CAK9T9XL2yi+BHaz81QwhIP QljahR9PuKqKAiz+pMDIREr50zdlprA/t9AFERAM8wcQfWOz7nJghGoJJQH2KTBjkk7U JLls3wwf9OZZahPOyInIxVFZGgE4EDI39PPl6KlxgwkAYDcuva4ZkTykYSwlF4nNTO1h fCv1t964DfMhyCupdXSASltoo8/xwU207AtGAJYACQsIfN1T4CUWUNEKVBWLOseHCM30 lasQ== X-Gm-Message-State: APjAAAUD9MvFDYeF5Wmlge9C7EENamNq+9YthYu0S+sA9PSMNtVd5Bq/ sU3A9Mri+ting7yBZOZU1bYnw/XH X-Google-Smtp-Source: APXvYqzxHQFvg7B1IoR9HrYpc+EV3zMUO+76rqpp/XVWBMUrpldAgOKUQpKy1Q8NRcFwZME2iPGndQ== X-Received: by 2002:a62:3501:: with SMTP id c1mr41146426pfa.184.1557837287163; Tue, 14 May 2019 05:34:47 -0700 (PDT) Received: from oslab.tsinghua.edu.cn ([2402:f000:4:72:808::3ca]) by smtp.gmail.com with ESMTPSA id g17sm20699149pfk.55.2019.05.14.05.34.44 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 14 May 2019 05:34:46 -0700 (PDT) From: Jia-Ju Bai To: pkshih@realtek.com, kvalo@codeaurora.org, davem@davemloft.net Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jia-Ju Bai Subject: [PATCH] rtlwifi: Fix null-pointer dereferences in error handling code of rtl_pci_probe() Date: Tue, 14 May 2019 20:34:39 +0800 Message-Id: <20190514123439.10524-1-baijiaju1990@gmail.com> X-Mailer: git-send-email 2.17.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org *BUG 1: In rtl_pci_probe(), when rtlpriv->cfg->ops->init_sw_vars() fails, rtl_deinit_core() in the error handling code is executed. rtl_deinit_core() calls rtl_free_entries_from_scan_list(), which uses rtlpriv->scan_list.list in list_for_each_entry_safe(), but it has been initialized. Thus a null-pointer dereference occurs. The reason is that rtlpriv->scan_list.list is initialized by INIT_LIST_HEAD() in rtl_init_core(), which has not been called. To fix this bug, rtl_deinit_core() should not be called when rtlpriv->cfg->ops->init_sw_vars() fails. *BUG 2: In rtl_pci_probe(), rtl_init_core() can fail when rtl_regd_init() in this function fails, and rtlpriv->scan_list.list has not been initialized by INIT_LIST_HEAD(). Then, rtl_deinit_core() in the error handling code of rtl_pci_probe() is executed. Finally, a null-pointer dereference occurs due to the same reason of the above bug. To fix this bug, the initialization of lists in rtl_init_core() are performed before the call to rtl_regd_init(). These bugs are found by a runtime fuzzing tool named FIZZER written by us. Signed-off-by: Jia-Ju Bai --- drivers/net/wireless/realtek/rtlwifi/base.c | 15 ++++++++------- drivers/net/wireless/realtek/rtlwifi/pci.c | 4 ++-- 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/net/wireless/realtek/rtlwifi/base.c b/drivers/net/wireless/realtek/rtlwifi/base.c index 217d2a7a43c7..b3f341ec3710 100644 --- a/drivers/net/wireless/realtek/rtlwifi/base.c +++ b/drivers/net/wireless/realtek/rtlwifi/base.c @@ -526,8 +526,14 @@ int rtl_init_core(struct ieee80211_hw *hw) /* <2> rate control register */ hw->rate_control_algorithm = "rtl_rc"; + /* <3> init list */ + INIT_LIST_HEAD(&rtlpriv->entry_list); + INIT_LIST_HEAD(&rtlpriv->scan_list.list); + skb_queue_head_init(&rtlpriv->tx_report.queue); + skb_queue_head_init(&rtlpriv->c2hcmd_queue); + /* - * <3> init CRDA must come after init + * <4> init CRDA must come after init * mac80211 hw in _rtl_init_mac80211. */ if (rtl_regd_init(hw, rtl_reg_notifier)) { @@ -535,7 +541,7 @@ int rtl_init_core(struct ieee80211_hw *hw) return 1; } - /* <4> locks */ + /* <5> locks */ mutex_init(&rtlpriv->locks.conf_mutex); mutex_init(&rtlpriv->locks.ips_mutex); mutex_init(&rtlpriv->locks.lps_mutex); @@ -550,11 +556,6 @@ int rtl_init_core(struct ieee80211_hw *hw) spin_lock_init(&rtlpriv->locks.cck_and_rw_pagea_lock); spin_lock_init(&rtlpriv->locks.fw_ps_lock); spin_lock_init(&rtlpriv->locks.iqk_lock); - /* <5> init list */ - INIT_LIST_HEAD(&rtlpriv->entry_list); - INIT_LIST_HEAD(&rtlpriv->scan_list.list); - skb_queue_head_init(&rtlpriv->tx_report.queue); - skb_queue_head_init(&rtlpriv->c2hcmd_queue); rtlmac->link_state = MAC80211_NOLINK; diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c index 48ca52102cef..864cb76230c4 100644 --- a/drivers/net/wireless/realtek/rtlwifi/pci.c +++ b/drivers/net/wireless/realtek/rtlwifi/pci.c @@ -2267,7 +2267,7 @@ int rtl_pci_probe(struct pci_dev *pdev, if (rtlpriv->cfg->ops->init_sw_vars(hw)) { pr_err("Can't init_sw_vars\n"); err = -ENODEV; - goto fail3; + goto fail2; } rtlpriv->cfg->ops->init_sw_leds(hw); -- 2.17.0