linux-kernel - [PATCH] ASoC: sdw_utils: Fix potential NULL pointer deref in is_sdca_endpoint

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Message-ID: <20250610103225.1475-2-thorsten.blum@linux.dev>
Date: Tue, 10 Jun 2025 12:32:16 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Bard Liao <yung-chuan.liao@...ux.intel.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>,
	Vijendar Mukunda <Vijendar.Mukunda@....com>,
	Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
	Charles Keepax <ckeepax@...nsource.cirrus.com>,
	Richard Fitzgerald <rf@...nsource.cirrus.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	stable@...r.kernel.org,
	Liam Girdwood <liam.r.girdwood@...el.com>,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: sdw_utils: Fix potential NULL pointer deref in is_sdca_endpoint_present()

Check the return value of kzalloc() and exit early to avoid a potential
NULL pointer dereference.

Cc: stable@...r.kernel.org
Fixes: 4f8ef33dd44a ("ASoC: soc_sdw_utils: skip the endpoint that doesn't present")
Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 sound/soc/sdw_utils/soc_sdw_utils.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/sdw_utils/soc_sdw_utils.c b/sound/soc/sdw_utils/soc_sdw_utils.c
index 30f84f4e7637..b70cb3793d8f 100644
--- a/sound/soc/sdw_utils/soc_sdw_utils.c
+++ b/sound/soc/sdw_utils/soc_sdw_utils.c
@@ -1180,6 +1180,8 @@ static int is_sdca_endpoint_present(struct device *dev,
 	int i;
 
 	dlc = kzalloc(sizeof(*dlc), GFP_KERNEL);
+	if (!dlc)
+		return -ENOMEM;
 
 	adr_end = &adr_dev->endpoints[end_index];
 	dai_info = &codec_info->dais[adr_end->num];
-- 
2.49.0