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 65C08C43603 for ; Tue, 10 Dec 2019 22:13:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 32183207FF for ; Tue, 10 Dec 2019 22:13:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576016037; bh=UQ5QM151xBNAmKqQ1a68CNfug4nr/qlV+mQ1CC7aVDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2gsvTnmLMtpf0RwcRooObulwDBket8sNpuLyWqzFsHxZX9W28EqIeOufZ3z1JMpEt TMRtzgrjk+it6CwhErYTJ1NFiXF8kwJP7CXv1ytpZ5uhrDYn0FsV6VFVicNpVJXrQr lf8R8kYOulsShmxO+o4w3EEovFRi8XzAmkfwJp2E= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729216AbfLJWN4 (ORCPT ); Tue, 10 Dec 2019 17:13:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:33092 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727317AbfLJWDL (ORCPT ); Tue, 10 Dec 2019 17:03:11 -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 29F7A208C3; Tue, 10 Dec 2019 22:03:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576015390; bh=UQ5QM151xBNAmKqQ1a68CNfug4nr/qlV+mQ1CC7aVDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vbqTkHGCrYGurnJ5vY9W58/a1dIq+gzEJsERk1F3FZRis7gqERrSFYFaFYECsQ+vO N+1zycDPhWujI2TstPcPt5+a78OASQuPk13McRCbCFBgP9iIi1cf9BoHsBA8dS9/L7 XNwSCH8mpT5LjCb+BLNWlUz4Iw4+Kt4OTDGK52p4= 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 4.14 007/130] staging: rtl8188eu: fix possible null dereference Date: Tue, 10 Dec 2019 17:00:58 -0500 Message-Id: <20191210220301.13262-7-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191210220301.13262-1-sashal@kernel.org> References: <20191210220301.13262-1-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 904b988ecc4ee..7c895af1ba31c 100644 --- a/drivers/staging/rtl8188eu/core/rtw_xmit.c +++ b/drivers/staging/rtl8188eu/core/rtw_xmit.c @@ -805,7 +805,7 @@ 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)) { @@ -813,7 +813,7 @@ 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