6.12-stable review patch. If anyone has any objections, please let me know.
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From: Denis Arefev arefev@swemel.ru
[ Upstream commit c34b04cc6178f33c08331568c7fd25c5b9a39f66 ]
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 [ sound/hda/codecs/side-codecs/ -> sound/pci/hda/ ] Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/pci/hda/cs35l41_hda.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/sound/pci/hda/cs35l41_hda.c +++ b/sound/pci/hda/cs35l41_hda.c @@ -1865,6 +1865,8 @@ static int cs35l41_hda_read_acpi(struct
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))