linux-kernel - [PATCH AUTOSEL 6.5 08/31] ASoC: core: Do not call link

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Message-Id: <20231018141151.1334501-8-sashal@kernel.org>
Date:   Wed, 18 Oct 2023 10:11:25 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, lgirdwood@...il.com,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 6.5 08/31] ASoC: core: Do not call link_exit() on uninitialized rtd objects

From: Amadeusz Sławiński <amadeuszx.slawinski@...ux.intel.com>

[ Upstream commit dd9f9cc1e6b9391140afa5cf27bb47c9e2a08d02 ]

On init we have sequence:

	for_each_card_prelinks(card, i, dai_link) {
		ret = snd_soc_add_pcm_runtime(card, dai_link);

	ret = init_some_other_things(...);
	if (ret)
		goto probe_end:

	for_each_card_rtds(card, rtd) {
		ret = soc_init_pcm_runtime(card, rtd);

probe_end:

while on exit:
	for_each_card_rtds(card, rtd)
		snd_soc_link_exit(rtd);

If init_some_other_things() step fails due to error we end up with
not fully setup rtds and try to call snd_soc_link_exit on them, which
depending on contents on .link_exit handler, can end up dereferencing
NULL pointer.

Reviewed-by: Cezary Rojewski <cezary.rojewski@...el.com>
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@...ux.intel.com>
Link: https://lore.kernel.org/r/20230929103243.705433-2-amadeuszx.slawinski@linux.intel.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/sound/soc.h  |  2 ++
 sound/soc/soc-core.c | 20 +++++++++++++++-----
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index b27f84580c5b0..cf34810882347 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1125,6 +1125,8 @@ struct snd_soc_pcm_runtime {
 	unsigned int pop_wait:1;
 	unsigned int fe_compr:1; /* for Dynamic PCM */
 
+	bool initialized;
+
 	int num_components;
 	struct snd_soc_component *components[]; /* CPU/Codec/Platform */
 };
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 1a0bde23f5e6f..2d85164457f73 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1259,7 +1259,7 @@ static int soc_init_pcm_runtime(struct snd_soc_card *card,
 	snd_soc_runtime_get_dai_fmt(rtd);
 	ret = snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt);
 	if (ret)
-		return ret;
+		goto err;
 
 	/* add DPCM sysfs entries */
 	soc_dpcm_debugfs_add(rtd);
@@ -1284,17 +1284,26 @@ static int soc_init_pcm_runtime(struct snd_soc_card *card,
 	/* create compress_device if possible */
 	ret = snd_soc_dai_compress_new(cpu_dai, rtd, num);
 	if (ret != -ENOTSUPP)
-		return ret;
+		goto err;
 
 	/* create the pcm */
 	ret = soc_new_pcm(rtd, num);
 	if (ret < 0) {
 		dev_err(card->dev, "ASoC: can't create pcm %s :%d\n",
 			dai_link->stream_name, ret);
-		return ret;
+		goto err;
 	}
 
-	return snd_soc_pcm_dai_new(rtd);
+	ret = snd_soc_pcm_dai_new(rtd);
+	if (ret < 0)
+		goto err;
+
+	rtd->initialized = true;
+
+	return 0;
+err:
+	snd_soc_link_exit(rtd);
+	return ret;
 }
 
 static void soc_set_name_prefix(struct snd_soc_card *card,
@@ -1892,7 +1901,8 @@ static void soc_cleanup_card_resources(struct snd_soc_card *card)
 
 	/* release machine specific resources */
 	for_each_card_rtds(card, rtd)
-		snd_soc_link_exit(rtd);
+		if (rtd->initialized)
+			snd_soc_link_exit(rtd);
 	/* remove and free each DAI */
 	soc_remove_link_dais(card);
 	soc_remove_link_components(card);
-- 
2.40.1