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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 2D875C04FE5 for ; Mon, 12 Apr 2021 16:48:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1A92B6023C for ; Mon, 12 Apr 2021 16:48:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345822AbhDLQsD (ORCPT ); Mon, 12 Apr 2021 12:48:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:41084 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245261AbhDLQiA (ORCPT ); Mon, 12 Apr 2021 12:38:00 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 96ED6613F5; Mon, 12 Apr 2021 16:28:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618244887; bh=euhgjXXNkcJQSNvxv39bc/OD0d1Z462dRZgO34zmjR8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uvAH4Sh2kt6msQQw0tki+PSIiebkDOSSdBmTHujjqtGihPFRhwV3DocMC5MVSuevY xvXgItE9mCj6OU0SfWSb949FAP5Mpr2O53JC8puWgCDYXEtfmZNvozaXgBgRKs9g/q uDCkEEMhN+ERVlvlda7qsIeWwiIA1LBfJ/MrEQHe5KHA1C3OTpenmuGE21jvdbxKxt 0H+x78RZ4N+mg4XdkBZeBQbgMRRAExc8Ilq0xSvMoG5hxquwxFTESDVQF8igsNbc3O NNTt5lyMx5IfQ51/u/z7uWIMywRshqZOayHLdvtaPQ2VXYkzehjMCBzr7SYTXrzqoA ImIbM4htFfrAA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Du Cheng , syzbot+5f9392825de654244975@syzkaller.appspotmail.com, Johannes Berg , Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 23/23] cfg80211: remove WARN_ON() in cfg80211_sme_connect Date: Mon, 12 Apr 2021 12:27:36 -0400 Message-Id: <20210412162736.316026-23-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210412162736.316026-1-sashal@kernel.org> References: <20210412162736.316026-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Du Cheng [ Upstream commit 1b5ab825d9acc0f27d2f25c6252f3526832a9626 ] A WARN_ON(wdev->conn) would trigger in cfg80211_sme_connect(), if multiple send_msg(NL80211_CMD_CONNECT) system calls are made from the userland, which should be anticipated and handled by the wireless driver. Remove this WARN_ON() to prevent kernel panic if kernel is configured to "panic_on_warn". Bug reported by syzbot. Reported-by: syzbot+5f9392825de654244975@syzkaller.appspotmail.com Signed-off-by: Du Cheng Link: https://lore.kernel.org/r/20210407162756.6101-1-ducheng2@gmail.com Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- net/wireless/sme.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/wireless/sme.c b/net/wireless/sme.c index 18b4a652cf41..784f1ee24e59 100644 --- a/net/wireless/sme.c +++ b/net/wireless/sme.c @@ -507,7 +507,7 @@ static int cfg80211_sme_connect(struct wireless_dev *wdev, if (wdev->current_bss) return -EALREADY; - if (WARN_ON(wdev->conn)) + if (wdev->conn) return -EINPROGRESS; wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL); -- 2.30.2