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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,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 1A9BAC4360F for ; Thu, 4 Apr 2019 09:42:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DD43320693 for ; Thu, 4 Apr 2019 09:42:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554370972; bh=wP5XRujaHrcdehCyXyr/80KZW4O6WIWQjjvV1vFpdiE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=cagTdxGRgAf/wg1bDIBiBxtRbGV8qEwO692q0c8HUW5URm7v1MJRyRo7ch2Z/I0Aa 9ld1/8I715po+glkLwRLIABiY+cZZv6zKfA0d42Te7SDc0Bx+EzS86TNVTyRNtIfV9 bnBZLB9PnPvgQ1H/coW7FwSy6Aa7OT3BhOhudlzc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731362AbfDDJBG (ORCPT ); Thu, 4 Apr 2019 05:01:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:37982 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731135AbfDDJBB (ORCPT ); Thu, 4 Apr 2019 05:01:01 -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 3E7DA218C3; Thu, 4 Apr 2019 09:01:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554368460; bh=wP5XRujaHrcdehCyXyr/80KZW4O6WIWQjjvV1vFpdiE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tT/CyHL2ymUphdGyErjA3+2EPsRap6yaOksY5oO9V4kmj32x6zILKr5uP2O8LvIry EsHQhUJnRASYJ1dH2nRltTy/LNMJ6O41QC3PpYAzQTDvs/+KWXIz4ynDcCjYyS1xRG TFEuvFPWB6kzDiTuh4alWuLyXooONLBDseencqF4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexei Avshalom Lazar , Maya Erez , Kalle Valo , Sasha Levin Subject: [PATCH 4.19 048/187] wil6210: check null pointer in _wil_cfg80211_merge_extra_ies Date: Thu, 4 Apr 2019 10:46:25 +0200 Message-Id: <20190404084605.333760569@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190404084603.119654039@linuxfoundation.org> References: <20190404084603.119654039@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit de77a53c2d1e8fb3621e63e8e1f0f0c9a1a99ff7 ] ies1 or ies2 might be null when code inside _wil_cfg80211_merge_extra_ies access them. Add explicit check for null and make sure ies1/ies2 are not accessed in such a case. spos might be null and be accessed inside _wil_cfg80211_merge_extra_ies. Add explicit check for null in the while condition statement and make sure spos is not accessed in such a case. Signed-off-by: Alexei Avshalom Lazar Signed-off-by: Maya Erez Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin --- drivers/net/wireless/ath/wil6210/cfg80211.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ath/wil6210/cfg80211.c b/drivers/net/wireless/ath/wil6210/cfg80211.c index f79c337105cb..2daf33342b23 100644 --- a/drivers/net/wireless/ath/wil6210/cfg80211.c +++ b/drivers/net/wireless/ath/wil6210/cfg80211.c @@ -1420,6 +1420,12 @@ static int _wil_cfg80211_merge_extra_ies(const u8 *ies1, u16 ies1_len, u8 *buf, *dpos; const u8 *spos; + if (!ies1) + ies1_len = 0; + + if (!ies2) + ies2_len = 0; + if (ies1_len == 0 && ies2_len == 0) { *merged_ies = NULL; *merged_len = 0; @@ -1429,17 +1435,19 @@ static int _wil_cfg80211_merge_extra_ies(const u8 *ies1, u16 ies1_len, buf = kmalloc(ies1_len + ies2_len, GFP_KERNEL); if (!buf) return -ENOMEM; - memcpy(buf, ies1, ies1_len); + if (ies1) + memcpy(buf, ies1, ies1_len); dpos = buf + ies1_len; spos = ies2; - while (spos + 1 < ies2 + ies2_len) { + while (spos && (spos + 1 < ies2 + ies2_len)) { /* IE tag at offset 0, length at offset 1 */ u16 ielen = 2 + spos[1]; if (spos + ielen > ies2 + ies2_len) break; if (spos[0] == WLAN_EID_VENDOR_SPECIFIC && - !_wil_cfg80211_find_ie(ies1, ies1_len, spos, ielen)) { + (!ies1 || !_wil_cfg80211_find_ie(ies1, ies1_len, + spos, ielen))) { memcpy(dpos, spos, ielen); dpos += ielen; } -- 2.19.1