linux-kernel - [PATCH] ALSA: hda: cs35l41: Possible null pointer dereference in cs35l41_hda

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Date: Fri, 31 May 2024 13:08:20 +0100
From: Simon Trimmer <simont@...nsource.cirrus.com>
To: <tiwai@...e.com>
CC: <linux-sound@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        "Simon
 Trimmer" <simont@...nsource.cirrus.com>
Subject: [PATCH] ALSA: hda: cs35l41: Possible null pointer dereference in cs35l41_hda_unbind()

The cs35l41_hda_unbind() function clears the hda_component entry
matching it's index and then dereferences the codec pointer held in the
first element of the hda_component array, this is an issue when the
device index was 0.

Instead use the codec pointer stashed in the cs35l41_hda structure as it
will still be valid.

Fixes: 7cf5ce66dfda ("ALSA: hda: cs35l41: Add device_link between HDA and cs35l41_hda")
Signed-off-by: Simon Trimmer <simont@...nsource.cirrus.com>
---
 sound/pci/hda/cs35l41_hda.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c
index 6c49e5c6cd20..d54d4d60b03e 100644
--- a/sound/pci/hda/cs35l41_hda.c
+++ b/sound/pci/hda/cs35l41_hda.c
@@ -1495,7 +1495,7 @@ static void cs35l41_hda_unbind(struct device *dev, struct device *master, void *
 	if (comps[cs35l41->index].dev == dev) {
 		memset(&comps[cs35l41->index], 0, sizeof(*comps));
 		sleep_flags = lock_system_sleep();
-		device_link_remove(&comps->codec->core.dev, cs35l41->dev);
+		device_link_remove(&cs35l41->codec->core.dev, cs35l41->dev);
 		unlock_system_sleep(sleep_flags);
 	}
 }
-- 
2.34.1