Re: [PATCH] ALSA: hda: cs35l41: Fix NULL pointer dereference in cs35l41_get_acpi_mute_state()

On Tue, 07 Oct 2025 09:38:31 +0200, Denis Arefev wrote:

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@vger.kernel.org Signed-off-by: Denis Arefev arefev@swemel.ru

Applied now. Thanks.

Takashi