From patchwork Mon May 16 19:35:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 573351 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 CF1EDC4332F for ; Mon, 16 May 2022 19:54:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239398AbiEPTyB (ORCPT ); Mon, 16 May 2022 15:54:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56574 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347725AbiEPTwQ (ORCPT ); Mon, 16 May 2022 15:52:16 -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 B8EDC41FAA; Mon, 16 May 2022 12:47:53 -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 0677660A6A; Mon, 16 May 2022 19:47:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 08EFFC385AA; Mon, 16 May 2022 19:47:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730470; bh=7LQLF750A6OWLQ2+tAwZUqWvU+022dEv0p9CNMvLXF4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CR42jwmTcE9OukT1qlJHLC+07kREjjnqyj1qkJb1/gJL/KULiXxqSrqCbNHK2C2zn R5LOzM+cYkbifx9muhtV4Ngx24ndvJ9D7R3f5EuXG2sBWFuirZwl2ivCHOcx1hI6c5 hIi8pqNXrsyJ7icpAXLyAChioXvaisrntdt7BZ0o= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Steven Rostedt , Johannes Berg , Gregory Greenman , Guenter Roeck , Kalle Valo , Sasha Levin , Sedat Dilek Subject: [PATCH 5.15 002/102] iwlwifi: iwl-dbg: Use del_timer_sync() before freeing Date: Mon, 16 May 2022 21:35:36 +0200 Message-Id: <20220516193624.062202071@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193623.989270214@linuxfoundation.org> References: <20220516193623.989270214@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Guenter Roeck [ Upstream commit 7635a1ad8d92dcc8247b53f949e37795154b5b6f ] In Chrome OS, a large number of crashes is observed due to corrupted timer lists. Steven Rostedt pointed out that this usually happens when a timer is freed while still active, and that the problem is often triggered by code calling del_timer() instead of del_timer_sync() just before freeing. Steven also identified the iwlwifi driver as one of the possible culprits since it does exactly that. Reported-by: Steven Rostedt Cc: Steven Rostedt Cc: Johannes Berg Cc: Gregory Greenman Fixes: 60e8abd9d3e91 ("iwlwifi: dbg_ini: add periodic trigger new API support") Signed-off-by: Guenter Roeck Acked-by: Gregory Greenman Tested-by: Sedat Dilek # Linux v5.17.3-rc1 and Debian LLVM-14 Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20220411154210.1870008-1-linux@roeck-us.net Signed-off-by: Sasha Levin --- drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c index 125479b5c0d6..fc4197bf2478 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c +++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c @@ -322,7 +322,7 @@ void iwl_dbg_tlv_del_timers(struct iwl_trans *trans) struct iwl_dbg_tlv_timer_node *node, *tmp; list_for_each_entry_safe(node, tmp, timer_list, list) { - del_timer(&node->timer); + del_timer_sync(&node->timer); list_del(&node->list); kfree(node); }