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From: Cezary Rojewski <cezary.rojewski@intel.com>
To: alsa-devel@alsa-project.org, tiwai@suse.com
Cc: Cezary Rojewski <cezary.rojewski@intel.com>,
	pierre-louis.bossart@linux.intel.com, hdegoede@redhat.com,
	broonie@kernel.org, amadeuszx.slawinski@linux.intel.com
Subject: [PATCH 6/9] ALSA: hda: Fix page fault in snd_hda_codec_shutdown()
Date: Wed,  6 Jul 2022 14:02:27 +0200	[thread overview]
Message-ID: <20220706120230.427296-7-cezary.rojewski@intel.com> (raw)
In-Reply-To: <20220706120230.427296-1-cezary.rojewski@intel.com>

If early probe of HDAudio bus driver fails e.g.: due to missing
firmware file, snd_hda_codec_shutdown() ends in manipulating
uninitialized codec->pcm_list_head causing page fault.

Iinitialization of HDAudio codec in ASoC is split in two:
- snd_hda_codec_device_init()
- snd_hda_codec_device_new()

snd_hda_codec_device_init() is called during probe_codecs() by HDAudio
bus driver while snd_hda_codec_device_new() is called by
codec-component's ->probe(). The second call will not happen until all
components required by related sound card are present within the ASoC
framework. With firmware failing to load during the PCI's deferred
initialization i.e.: probe_work(), no platform components are ever
registered. HDAudio codec enumeration is done at that point though, so
the codec components became registered to ASoC framework, calling
snd_hda_codec_device_init() in the process.

Now, during platform reboot snd_hda_codec_shutdown() is called for every
codec found on the HDAudio bus causing oops if any of them has not
completed both of their initialization steps. Relocating field
initialization fixes the issue.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
---
 sound/pci/hda/hda_codec.c | 41 +++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 21 deletions(-)

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 75e85bf58681..677d0a78f19c 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -930,8 +930,28 @@ snd_hda_codec_device_init(struct hda_bus *bus, unsigned int codec_addr,
 	}
 
 	codec->bus = bus;
+	codec->depop_delay = -1;
+	codec->fixup_id = HDA_FIXUP_ID_NOT_SET;
+	codec->core.dev.release = snd_hda_codec_dev_release;
+	codec->core.exec_verb = codec_exec_verb;
 	codec->core.type = HDA_DEV_LEGACY;
 
+	mutex_init(&codec->spdif_mutex);
+	mutex_init(&codec->control_mutex);
+	snd_array_init(&codec->mixers, sizeof(struct hda_nid_item), 32);
+	snd_array_init(&codec->nids, sizeof(struct hda_nid_item), 32);
+	snd_array_init(&codec->init_pins, sizeof(struct hda_pincfg), 16);
+	snd_array_init(&codec->driver_pins, sizeof(struct hda_pincfg), 16);
+	snd_array_init(&codec->cvt_setups, sizeof(struct hda_cvt_setup), 8);
+	snd_array_init(&codec->spdif_out, sizeof(struct hda_spdif_out), 16);
+	snd_array_init(&codec->jacktbl, sizeof(struct hda_jack_tbl), 16);
+	snd_array_init(&codec->verbs, sizeof(struct hda_verb *), 8);
+	INIT_LIST_HEAD(&codec->conn_list);
+	INIT_LIST_HEAD(&codec->pcm_list_head);
+	INIT_DELAYED_WORK(&codec->jackpoll_work, hda_jackpoll_work);
+	refcount_set(&codec->pcm_ref, 1);
+	init_waitqueue_head(&codec->remove_sleep);
+
 	return codec;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_device_init);
@@ -984,29 +1004,8 @@ int snd_hda_codec_device_new(struct hda_bus *bus, struct snd_card *card,
 	if (snd_BUG_ON(codec_addr > HDA_MAX_CODEC_ADDRESS))
 		return -EINVAL;
 
-	codec->core.dev.release = snd_hda_codec_dev_release;
-	codec->core.exec_verb = codec_exec_verb;
-
 	codec->card = card;
 	codec->addr = codec_addr;
-	mutex_init(&codec->spdif_mutex);
-	mutex_init(&codec->control_mutex);
-	snd_array_init(&codec->mixers, sizeof(struct hda_nid_item), 32);
-	snd_array_init(&codec->nids, sizeof(struct hda_nid_item), 32);
-	snd_array_init(&codec->init_pins, sizeof(struct hda_pincfg), 16);
-	snd_array_init(&codec->driver_pins, sizeof(struct hda_pincfg), 16);
-	snd_array_init(&codec->cvt_setups, sizeof(struct hda_cvt_setup), 8);
-	snd_array_init(&codec->spdif_out, sizeof(struct hda_spdif_out), 16);
-	snd_array_init(&codec->jacktbl, sizeof(struct hda_jack_tbl), 16);
-	snd_array_init(&codec->verbs, sizeof(struct hda_verb *), 8);
-	INIT_LIST_HEAD(&codec->conn_list);
-	INIT_LIST_HEAD(&codec->pcm_list_head);
-	refcount_set(&codec->pcm_ref, 1);
-	init_waitqueue_head(&codec->remove_sleep);
-
-	INIT_DELAYED_WORK(&codec->jackpoll_work, hda_jackpoll_work);
-	codec->depop_delay = -1;
-	codec->fixup_id = HDA_FIXUP_ID_NOT_SET;
 
 #ifdef CONFIG_PM
 	codec->power_jiffies = jiffies;
-- 
2.25.1


  parent reply	other threads:[~2022-07-06 11:55 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-06 12:02 [PATCH 0/9] ALSA: hda: Codec-reload bug fixes and cleanups Cezary Rojewski
2022-07-06 12:02 ` [PATCH 1/9] ALSA: hda: Do not unset preset when cleaning up codec Cezary Rojewski
2022-07-09 16:34   ` Takashi Iwai
2022-07-11  8:25     ` Cezary Rojewski
2022-07-11 14:12       ` Takashi Iwai
2022-07-12  9:42         ` Cezary Rojewski
2022-07-12 10:46           ` Takashi Iwai
2022-07-12 10:58             ` Cezary Rojewski
2022-07-15 14:55               ` Takashi Iwai
2023-01-17 14:45                 ` Cezary Rojewski
2023-01-17 14:51                   ` Takashi Iwai
2022-07-06 12:02 ` [PATCH 2/9] ALSA: hda: Fix null-ptr-deref when i915 fails and hdmi is denylisted Cezary Rojewski
2022-07-06 12:02 ` [PATCH 3/9] ALSA: hda: Make device usage_count consistent across subsequent probing Cezary Rojewski
2022-07-06 12:02 ` [PATCH 4/9] ALSA: hda: Fix put_device() inconsistency in error path Cezary Rojewski
2022-07-06 12:02 ` [PATCH 5/9] ALSA: hda: Skip event processing for unregistered codecs Cezary Rojewski
2022-07-09 16:47   ` Takashi Iwai
2022-07-15 14:27     ` Takashi Iwai
2022-07-06 12:02 ` Cezary Rojewski [this message]
2022-07-15 18:16   ` [PATCH 6/9] ALSA: hda: Fix page fault in snd_hda_codec_shutdown() Pierre-Louis Bossart
2022-07-15 18:23     ` Takashi Iwai
2022-07-17 10:05       ` Cezary Rojewski
2022-07-06 12:02 ` [PATCH 7/9] ALSA: hda: Reset all SIE bits in INTCTL Cezary Rojewski
2022-07-06 12:02 ` [PATCH 8/9] ALSA: hda: Remove unused macro definition Cezary Rojewski
2022-07-06 12:02 ` [PATCH 9/9] ALSA: hda/realtek: Remove redundant init_hook() in alc_default_init() Cezary Rojewski
2022-07-09 16:46   ` Takashi Iwai
2022-07-11  8:12     ` Cezary Rojewski
2022-07-09 16:50 ` [PATCH 0/9] ALSA: hda: Codec-reload bug fixes and cleanups Takashi Iwai

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