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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,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 9A6D8C433FF for ; Tue, 30 Jul 2019 14:32:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7C0162089E for ; Tue, 30 Jul 2019 14:32:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731437AbfG3OcJ (ORCPT ); Tue, 30 Jul 2019 10:32:09 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:40348 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728527AbfG3OcJ (ORCPT ); Tue, 30 Jul 2019 10:32:09 -0400 Received: from 1.general.cking.uk.vpn ([10.172.193.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1hsTAc-0005LT-6L; Tue, 30 Jul 2019 14:32:06 +0000 From: Colin King To: John Crispin , Johannes Berg , "David S . Miller" , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH][net-next] mac80211: add missing null return check from call to ieee80211_get_sband Date: Tue, 30 Jul 2019 15:32:05 +0100 Message-Id: <20190730143205.14261-1-colin.king@canonical.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Colin Ian King The return from ieee80211_get_sband can potentially be a null pointer, so it seems prudent to add a null check to avoid a null pointer dereference on sband. Addresses-Coverity: ("Dereference null return") Fixes: 2ab45876756f ("mac80211: add support for the ADDBA extension element") Signed-off-by: Colin Ian King --- net/mac80211/agg-rx.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c index 0e1bb43973b8..4d1c335e06e5 100644 --- a/net/mac80211/agg-rx.c +++ b/net/mac80211/agg-rx.c @@ -189,6 +189,8 @@ static void ieee80211_add_addbaext(struct ieee80211_sub_if_data *sdata, u8 *pos; sband = ieee80211_get_sband(sdata); + if (!sband) + return; he_cap = ieee80211_get_he_iftype_cap(sband, sdata->vif.type); if (!he_cap) return; -- 2.20.1