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=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 BDE52C43603 for ; Tue, 10 Dec 2019 21:47:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9032820828 for ; Tue, 10 Dec 2019 21:47:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576014427; bh=KJh5vYh77g3ucGq8Feg7JBwxd4Gl7DDHaUILR3azn0M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0635Ql8WDa7MHD6VQ4UWAhPxKAC6s71KWPMIDDvPGsBmpVgYROnfl9cYM9ShsEJ5p 2KmlAUx3KEhLkdhAhaOQf+WBV8lirogSuddprmtkrTSxQ+Qe4PXBBKUGO51GvXL2in i296M/UFivNW/QlGR49I0DkiYdPjUrb4wAlt0iv0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729994AbfLJVrG (ORCPT ); Tue, 10 Dec 2019 16:47:06 -0500 Received: from mail.kernel.org ([198.145.29.99]:36152 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728837AbfLJVcd (ORCPT ); Tue, 10 Dec 2019 16:32:33 -0500 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 42E412073B; Tue, 10 Dec 2019 21:32:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576013553; bh=KJh5vYh77g3ucGq8Feg7JBwxd4Gl7DDHaUILR3azn0M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K6onerVCmlMQSbnAG/1WF9xPtA+eT/QFsrN2iDd/U5wSrmTCMiXKdm56I/r33br0m n3G+2o52TL2KyI7Cmrjs50qh/awq0jZ5InOTDl/YwvoRfxqO1TMQ9eyhcVhze1XHYP PmbdRM4hmZGxUMDio5nQ370Q/V+QJVgj8V0nObC0= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Connor Kuehl , Larry Finger , Greg Kroah-Hartman , Sasha Levin , devel@driverdev.osuosl.org Subject: [PATCH AUTOSEL 4.19 009/177] staging: rtl8188eu: fix possible null dereference Date: Tue, 10 Dec 2019 16:29:33 -0500 Message-Id: <20191210213221.11921-9-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191210213221.11921-1-sashal@kernel.org> References: <20191210213221.11921-1-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: Connor Kuehl [ Upstream commit 228241944a48113470d3c3b46c88ba7fbe0a274b ] Inside a nested 'else' block at the beginning of this function is a call that assigns 'psta' to the return value of 'rtw_get_stainfo()'. If 'rtw_get_stainfo()' returns NULL and the flow of control reaches the 'else if' where 'psta' is dereferenced, then we will dereference a NULL pointer. Fix this by checking if 'psta' is not NULL before reading its 'psta->qos_option' data member. Addresses-Coverity: ("Dereference null return value") Signed-off-by: Connor Kuehl Acked-by: Larry Finger Link: https://lore.kernel.org/r/20190926150317.5894-1-connor.kuehl@canonical.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/staging/rtl8188eu/core/rtw_xmit.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/rtl8188eu/core/rtw_xmit.c b/drivers/staging/rtl8188eu/core/rtw_xmit.c index dd9b02d316f30..c6a5b62cb3639 100644 --- a/drivers/staging/rtl8188eu/core/rtw_xmit.c +++ b/drivers/staging/rtl8188eu/core/rtw_xmit.c @@ -778,7 +778,7 @@ s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr, struct pkt_attrib *pattr memcpy(pwlanhdr->addr2, get_bssid(pmlmepriv), ETH_ALEN); memcpy(pwlanhdr->addr3, pattrib->src, ETH_ALEN); - if (psta->qos_option) + if (psta && psta->qos_option) qos_option = true; } else if (check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) || check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE)) { @@ -786,7 +786,7 @@ s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr, struct pkt_attrib *pattr memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN); memcpy(pwlanhdr->addr3, get_bssid(pmlmepriv), ETH_ALEN); - if (psta->qos_option) + if (psta && psta->qos_option) qos_option = true; } else { RT_TRACE(_module_rtl871x_xmit_c_, _drv_err_, ("fw_state:%x is not allowed to xmit frame\n", get_fwstate(pmlmepriv))); -- 2.20.1