The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x c34b04cc6178f33c08331568c7fd25c5b9a39f66 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025121643-crust-motocross-9384@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From c34b04cc6178f33c08331568c7fd25c5b9a39f66 Mon Sep 17 00:00:00 2001 From: Denis Arefev arefev@swemel.ru Date: Tue, 2 Dec 2025 13:13:36 +0300 Subject: [PATCH] ALSA: hda: cs35l41: Fix NULL pointer dereference in cs35l41_hda_read_acpi()

The acpi_get_first_physical_node() function can return NULL, in which case the get_device() function also returns NULL, but this value is then dereferenced without checking,so add a check to prevent a crash.

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

Fixes: 7b2f3eb492da ("ALSA: hda: cs35l41: Add support for CS35L41 in HDA systems") Cc: stable@vger.kernel.org Signed-off-by: Denis Arefev arefev@swemel.ru Reviewed-by: Richard Fitzgerald rf@opensource.cirrus.com Signed-off-by: Takashi Iwai tiwai@suse.de Link: https://patch.msgid.link/20251202101338.11437-1-arefev@swemel.ru

diff --git a/sound/hda/codecs/side-codecs/cs35l41_hda.c b/sound/hda/codecs/side-codecs/cs35l41_hda.c index c0f2a3ff77a1..21e00055c0c4 100644 --- a/sound/hda/codecs/side-codecs/cs35l41_hda.c +++ b/sound/hda/codecs/side-codecs/cs35l41_hda.c @@ -1901,6 +1901,8 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i

cs35l41->dacpi = adev; physdev = get_device(acpi_get_first_physical_node(adev)); + if (!physdev) + return -ENODEV;

sub = acpi_get_subsystem_id(ACPI_HANDLE(physdev)); if (IS_ERR(sub))