linux-kernel - [PATCH v2] ALSA: hda: Fix missing pointer check in hda_component_manager

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Message-ID: <20251009105050.20806-1-arefev@swemel.ru>
Date: Thu,  9 Oct 2025 13:50:47 +0300
From: Denis Arefev <arefev@...mel.ru>
To: David Rhodes <david.rhodes@...rus.com>
Cc: Richard Fitzgerald <rf@...nsource.cirrus.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	linux-sound@...r.kernel.org,
	patches@...nsource.cirrus.com,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org,
	stable@...r.kernel.org
Subject: [PATCH v2] ALSA: hda: Fix missing pointer check in hda_component_manager_init function

The __component_match_add function may assign the 'matchptr' pointer
the value ERR_PTR(-ENOMEM), which will subsequently be dereferenced.

The call stack leading to the error looks like this:

hda_component_manager_init
|-> component_match_add
    |-> component_match_add_release
        |-> __component_match_add ( ... ,**matchptr, ... )
            |-> *matchptr = ERR_PTR(-ENOMEM);       // assign
|-> component_master_add_with_match( ...  match)
    |-> component_match_realloc(match, match->num); // dereference

Add IS_ERR() check to prevent the crash.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: ae7abe36e352 ("ALSA: hda/realtek: Add CS35L41 support for Thinkpad laptops")
Cc: stable@...r.kernel.org
Signed-off-by: Denis Arefev <arefev@...mel.ru>
---
V1 -> V2:
Changed tag Fixes
Add print to log an error it as Stefan Binding <sbinding@...nsource.cirrus.com> suggested

 sound/hda/codecs/side-codecs/hda_component.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/hda/codecs/side-codecs/hda_component.c b/sound/hda/codecs/side-codecs/hda_component.c
index bcf47a301697..603a9b8ca481 100644
--- a/sound/hda/codecs/side-codecs/hda_component.c
+++ b/sound/hda/codecs/side-codecs/hda_component.c
@@ -174,6 +174,10 @@ int hda_component_manager_init(struct hda_codec *cdc,
 		sm->match_str = match_str;
 		sm->index = i;
 		component_match_add(dev, &match, hda_comp_match_dev_name, sm);
+		if (IS_ERR(match)) {
+			codec_err(cdc, "Fail to add component %ld\n", PTR_ERR(match));
+			return PTR_ERR(match);
+		}
 	}
 
 	ret = component_master_add_with_match(dev, ops, match);
-- 
2.43.0