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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 C7372C3A5A3 for ; Tue, 27 Aug 2019 08:15:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9A7BD2173E for ; Tue, 27 Aug 2019 08:15:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566893729; bh=qXVSr0YLceTXHfH0UDfxs8Fkzg59EqLQSN1g3fRdwZU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=O054QAMkSkHjffZdZAqw7K1IfEi26+w8zYqfy1dzAJ9Co5gb01oG2S8ep49Wkxo5Z 3mB3iOgIpuHixVRDPf+JvMpdvxaPNuX0ODBYJzSsSw6VQdNP6bCkF4m9JT6bnE9JQp wftFkQe6Bs2561wthU7ymGG/ecAjwOHZoJWA6jks= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729585AbfH0IPZ (ORCPT ); Tue, 27 Aug 2019 04:15:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:47146 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730318AbfH0HzW (ORCPT ); Tue, 27 Aug 2019 03:55:22 -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 87DAD206BF; Tue, 27 Aug 2019 07:55:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566892521; bh=qXVSr0YLceTXHfH0UDfxs8Fkzg59EqLQSN1g3fRdwZU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rb2QELoSX4GyoLNGkentA4A3Jn04E0HNBrUxkXyKa04b0GI5N1rvU7goTuQb53gdY o8T8zXzTqzS6cbNHcrRLbEbrmeUoG62skzB4e8qo2TYzYJdL/pDdnyiFLed4mlexoJ tosMxwHDaaodjOGbZexfeypkJ3/Be0yXoFOfaf24= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jia-Ju Bai , Johannes Berg , Sasha Levin Subject: [PATCH 4.19 22/98] mac80211_hwsim: Fix possible null-pointer dereferences in hwsim_dump_radio_nl() Date: Tue, 27 Aug 2019 09:50:01 +0200 Message-Id: <20190827072719.418541337@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190827072718.142728620@linuxfoundation.org> References: <20190827072718.142728620@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit b55f3b841099e641bdb2701d361a4c304e2dbd6f ] In hwsim_dump_radio_nl(), when genlmsg_put() on line 3617 fails, hdr is assigned to NULL. Then hdr is used on lines 3622 and 3623: genl_dump_check_consistent(cb, hdr); genlmsg_end(skb, hdr); Thus, possible null-pointer dereferences may occur. To fix these bugs, hdr is used here when it is not NULL. This bug is found by a static analysis tool STCheck written by us. Signed-off-by: Jia-Ju Bai Link: https://lore.kernel.org/r/20190729082332.28895-1-baijiaju1990@gmail.com [put braces on all branches] Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- drivers/net/wireless/mac80211_hwsim.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c index 7cd428c0af433..ce2dd06af62e8 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -3502,10 +3502,12 @@ static int hwsim_dump_radio_nl(struct sk_buff *skb, hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, &hwsim_genl_family, NLM_F_MULTI, HWSIM_CMD_GET_RADIO); - if (!hdr) + if (hdr) { + genl_dump_check_consistent(cb, hdr); + genlmsg_end(skb, hdr); + } else { res = -EMSGSIZE; - genl_dump_check_consistent(cb, hdr); - genlmsg_end(skb, hdr); + } } done: -- 2.20.1