From patchwork Tue Apr 26 08:21:28 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: 567986 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 57088C433FE for ; Tue, 26 Apr 2022 08:37:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345250AbiDZIkF (ORCPT ); Tue, 26 Apr 2022 04:40:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60142 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345811AbiDZIje (ORCPT ); Tue, 26 Apr 2022 04:39:34 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D124F7561B; Tue, 26 Apr 2022 01:31:33 -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 ams.source.kernel.org (Postfix) with ESMTPS id 81C3EB81CFA; Tue, 26 Apr 2022 08:31:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D3DECC385A0; Tue, 26 Apr 2022 08:31:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650961891; bh=54ru7jmsYeb+6NcxA9Lx7UBKfdTBBkj99yZhfnF44SM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ca5v25Fe6bOEPOFhVRuskX73f6CuWOTU19rzU11+gEW64ix+Pu5d4B4f1K3M1f+/j JwnGBZy8II/izJMDBg907+34Fdzq1H4AnTMM8V/7Lv9egJpDcU++pcM1dcT7RdUajc 0RGCqnhy4l0F6xgeCqPehaIeD+yEzGI0+Q3ELgA8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xiaomeng Tong , Mark Brown Subject: [PATCH 5.4 48/62] ASoC: soc-dapm: fix two incorrect uses of list iterator Date: Tue, 26 Apr 2022 10:21:28 +0200 Message-Id: <20220426081738.599580762@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220426081737.209637816@linuxfoundation.org> References: <20220426081737.209637816@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Xiaomeng Tong commit f730a46b931d894816af34a0ff8e4ad51565b39f upstream. These two bug are here: list_for_each_entry_safe_continue(w, n, list, power_list); list_for_each_entry_safe_continue(w, n, list, power_list); After the list_for_each_entry_safe_continue() exits, the list iterator will always be a bogus pointer which point to an invalid struct objdect containing HEAD member. The funciton poniter 'w->event' will be a invalid value which can lead to a control-flow hijack if the 'w' can be controlled. The original intention was to continue the outer list_for_each_entry_safe() loop with the same entry if w->event is NULL, but misunderstanding the meaning of list_for_each_entry_safe_continue(). So just add a 'continue;' to fix the bug. Cc: stable@vger.kernel.org Fixes: 163cac061c973 ("ASoC: Factor out DAPM sequence execution") Signed-off-by: Xiaomeng Tong Link: https://lore.kernel.org/r/20220329012134.9375-1-xiam0nd.tong@gmail.com Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- sound/soc/soc-dapm.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -1676,8 +1676,7 @@ static void dapm_seq_run(struct snd_soc_ switch (w->id) { case snd_soc_dapm_pre: if (!w->event) - list_for_each_entry_safe_continue(w, n, list, - power_list); + continue; if (event == SND_SOC_DAPM_STREAM_START) ret = w->event(w, @@ -1689,8 +1688,7 @@ static void dapm_seq_run(struct snd_soc_ case snd_soc_dapm_post: if (!w->event) - list_for_each_entry_safe_continue(w, n, list, - power_list); + continue; if (event == SND_SOC_DAPM_STREAM_START) ret = w->event(w,