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 1B2DFC64EC4 for ; Mon, 20 Feb 2023 13:58:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232655AbjBTN6f (ORCPT ); Mon, 20 Feb 2023 08:58:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232644AbjBTN6e (ORCPT ); Mon, 20 Feb 2023 08:58:34 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE3C21CF72 for ; Mon, 20 Feb 2023 05:57:58 -0800 (PST) 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 DAF8EB80D56 for ; Mon, 20 Feb 2023 13:57:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3F94FC4339B; Mon, 20 Feb 2023 13:57:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1676901431; bh=2KHn4SYMmwidIr5JYfKHTCQ0IIRhcvyKS7hBDZnQ3hQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HCrUq7ZAEDfFJaqMCn3ZtTsCQZN69RiLonEj8dJKpfzXVVKdyOBAHrc90/zDjqVfd XTOZykDhpD23IEV10SB7oVcUnCrg9YYp+kyJ7Vk6RFmw08Id61LfHIWCel3AqYv/rv hk5Zj+Vt6RoQtC9iF9eVnd+mD5+Q/QW8KymGmHTs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Takashi Iwai , Cezary Rojewski , Takashi Iwai , Sasha Levin Subject: [PATCH 6.1 015/118] ALSA: hda: Do not unset preset when cleaning up codec Date: Mon, 20 Feb 2023 14:35:31 +0100 Message-Id: <20230220133601.017003834@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230220133600.368809650@linuxfoundation.org> References: <20230220133600.368809650@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: Cezary Rojewski [ Upstream commit 87978e6ad45a16835cc58234451111091be3c59a ] Several functions that take part in codec's initialization and removal are re-used by ASoC codec drivers implementations. Drivers mimic the behavior of hda_codec_driver_probe/remove() found in sound/pci/hda/hda_bind.c with their component->probe/remove() instead. One of the reasons for that is the expectation of snd_hda_codec_device_new() to receive a valid pointer to an instance of struct snd_card. This expectation can be met only once sound card components probing commences. As ASoC sound card may be unbound without codec device being actually removed from the system, unsetting ->preset in snd_hda_codec_cleanup_for_unbind() interferes with module unload -> load scenario causing null-ptr-deref. Preset is assigned only once, during device/driver matching whereas ASoC codec driver's module reloading may occur several times throughout the lifetime of an audio stack. Suggested-by: Takashi Iwai Signed-off-by: Cezary Rojewski Link: https://lore.kernel.org/r/20230119143235.1159814-1-cezary.rojewski@intel.com Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/pci/hda/hda_bind.c | 2 ++ sound/pci/hda/hda_codec.c | 1 - 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/sound/pci/hda/hda_bind.c b/sound/pci/hda/hda_bind.c index 1a868dd9dc4b6..890c2f7c33fc2 100644 --- a/sound/pci/hda/hda_bind.c +++ b/sound/pci/hda/hda_bind.c @@ -144,6 +144,7 @@ static int hda_codec_driver_probe(struct device *dev) error: snd_hda_codec_cleanup_for_unbind(codec); + codec->preset = NULL; return err; } @@ -166,6 +167,7 @@ static int hda_codec_driver_remove(struct device *dev) if (codec->patch_ops.free) codec->patch_ops.free(codec); snd_hda_codec_cleanup_for_unbind(codec); + codec->preset = NULL; module_put(dev->driver->owner); return 0; } diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index edd653ece70d7..ac1cc7c5290e3 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -795,7 +795,6 @@ void snd_hda_codec_cleanup_for_unbind(struct hda_codec *codec) snd_array_free(&codec->cvt_setups); snd_array_free(&codec->spdif_out); snd_array_free(&codec->verbs); - codec->preset = NULL; codec->follower_dig_outs = NULL; codec->spdif_status_reset = 0; snd_array_free(&codec->mixers); -- 2.39.0