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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E76D1C77B73 for ; Mon, 8 May 2023 11:41:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236073AbjEHLl1 (ORCPT ); Mon, 8 May 2023 07:41:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36982 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236209AbjEHLlD (ORCPT ); Mon, 8 May 2023 07:41:03 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 76CDB40322 for ; Mon, 8 May 2023 04:40:40 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E58F463551 for ; Mon, 8 May 2023 11:40:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F28BCC4339B; Mon, 8 May 2023 11:40:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683546039; bh=qUQoZMWzW+39BJYc8bIgxgetzKK/qkaa2r/ubNlLaAc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eyWuuCDBVpBZ5PYMdHgIVxyXmy/E87tgmQQQdGleFuYTNX2xml1I3EReWDDF60rYC kNiwNmIrKZLk5ChAwG/46K1XJiaVgXIVasYTidIU5vasNRbVXhaKYoEwrM8PO5Ui7d VfER/R2MiUENTrCiMPcG88Y9qt6F73xLeT4ir7JA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Duoming Zhou , Hans de Goede , Sasha Levin Subject: [PATCH 5.15 237/371] drivers: staging: rtl8723bs: Fix locking in _rtw_join_timeout_handler() Date: Mon, 8 May 2023 11:47:18 +0200 Message-Id: <20230508094821.466363114@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094811.912279944@linuxfoundation.org> References: <20230508094811.912279944@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Hans de Goede [ Upstream commit 215792eda008f6a1e7ed9d77fa20d582d22bb114 ] Commit 041879b12ddb ("drivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle()") besides fixing the deadlock also modified _rtw_join_timeout_handler() to use spin_[un]lock_irq() instead of spin_[un]lock_bh(). _rtw_join_timeout_handler() calls rtw_do_join() which takes pmlmepriv->scanned_queue.lock using spin_[un]lock_bh(). This spin_unlock_bh() call re-enables softirqs which triggers an oops in kernel/softirq.c: __local_bh_enable_ip() when it calls lockdep_assert_irqs_enabled(): [ 244.506087] WARNING: CPU: 2 PID: 0 at kernel/softirq.c:376 __local_bh_enable_ip+0xa6/0x100 ... [ 244.509022] Call Trace: [ 244.509048] [ 244.509100] _rtw_join_timeout_handler+0x134/0x170 [r8723bs] [ 244.509468] ? __pfx__rtw_join_timeout_handler+0x10/0x10 [r8723bs] [ 244.509772] ? __pfx__rtw_join_timeout_handler+0x10/0x10 [r8723bs] [ 244.510076] call_timer_fn+0x95/0x2a0 [ 244.510200] __run_timers.part.0+0x1da/0x2d0 This oops is causd by the switch to spin_[un]lock_irq() which disables the IRQs for the entire duration of _rtw_join_timeout_handler(). Disabling the IRQs is not necessary since all code taking this lock runs from either user contexts or from softirqs, switch back to spin_[un]lock_bh() to fix this. Fixes: 041879b12ddb ("drivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle()") Cc: Duoming Zhou Signed-off-by: Hans de Goede Link: https://lore.kernel.org/r/20230221145326.7808-1-hdegoede@redhat.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/staging/rtl8723bs/core/rtw_mlme.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme.c b/drivers/staging/rtl8723bs/core/rtw_mlme.c index 26c40042d2bed..f85ef7dd61b24 100644 --- a/drivers/staging/rtl8723bs/core/rtw_mlme.c +++ b/drivers/staging/rtl8723bs/core/rtw_mlme.c @@ -1547,7 +1547,7 @@ void _rtw_join_timeout_handler(struct timer_list *t) if (adapter->bDriverStopped || adapter->bSurpriseRemoved) return; - spin_lock_irq(&pmlmepriv->lock); + spin_lock_bh(&pmlmepriv->lock); if (rtw_to_roam(adapter) > 0) { /* join timeout caused by roaming */ while (1) { @@ -1575,7 +1575,7 @@ void _rtw_join_timeout_handler(struct timer_list *t) } - spin_unlock_irq(&pmlmepriv->lock); + spin_unlock_bh(&pmlmepriv->lock); } /* -- 2.39.2