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Message-ID: <20251007073832.3662-1-arefev@swemel.ru>
Date: Tue, 7 Oct 2025 10:38:31 +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>,
Stefan Binding <sbinding@...nsource.cirrus.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] ALSA: hda: cs35l41: Fix NULL pointer dereference in cs35l41_get_acpi_mute_state()
Return value of a function acpi_evaluate_dsm() is dereferenced without
checking for NULL, but it is usually checked for this function.
acpi_evaluate_dsm() may return NULL, when acpi_evaluate_object() returns
acpi_status other than ACPI_SUCCESS, so add a check to prevent the crach.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 447106e92a0c ("ALSA: hda: cs35l41: Support mute notifications for CS35L41 HDA")
Cc: stable@...r.kernel.org
Signed-off-by: Denis Arefev <arefev@...mel.ru>
---
sound/hda/codecs/side-codecs/cs35l41_hda.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/sound/hda/codecs/side-codecs/cs35l41_hda.c b/sound/hda/codecs/side-codecs/cs35l41_hda.c
index 37f2cdc8ce82..890ddb8cc66c 100644
--- a/sound/hda/codecs/side-codecs/cs35l41_hda.c
+++ b/sound/hda/codecs/side-codecs/cs35l41_hda.c
@@ -1426,6 +1426,8 @@ static int cs35l41_get_acpi_mute_state(struct cs35l41_hda *cs35l41, acpi_handle
if (cs35l41_dsm_supported(handle, CS35L41_DSM_GET_MUTE)) {
ret = acpi_evaluate_dsm(handle, &guid, 0, CS35L41_DSM_GET_MUTE, NULL);
+ if (!ret)
+ return -EINVAL;
mute = *ret->buffer.pointer;
dev_dbg(cs35l41->dev, "CS35L41_DSM_GET_MUTE: %d\n", mute);
}
--
2.43.0
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