[PATCH 4.19 040/361] ALSA: hda - Fix incorrect clearance of thinkpad_acpi hooks

Greg Kroah-Hartman
2018-11-12T00:17:26Z

From: Takashi Iwai <tiwai@suse.de>

commit 5e93a125f521efd00d71af31c2a301f3d46af48c upstream.

Since the commit c647f806b8c2 ("ALSA: hda - Allow multiple ADCs for
mic mute LED controls") we allow enabling the mic mute LED with
multiple ADCs. The commit changed the function return value to be
zero or a negative error, while this change was overlooked in the
thinkpad_acpi helper code where it still expects a positive return
value for success. This eventually leads to a NULL dereference on a
system that has only a mic mute LED.

This patch corrects the return value check in the corresponding code
as well.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=201621
Fixes: c647f806b8c2 ("ALSA: hda - Allow multiple ADCs for mic mute LED controls")
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
sound/pci/hda/thinkpad_helper.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/sound/pci/hda/thinkpad_helper.c
+++ b/sound/pci/hda/thinkpad_helper.c
@@ -58,8 +58,8 @@ static void hda_fixup_thinkpad_acpi(stru
removefunc = false;
}
if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0 &&
- snd_hda_gen_add_micmute_led(codec,
- update_tpacpi_micmute) > 0)
+ !snd_hda_gen_add_micmute_led(codec,
+ update_tpacpi_micmute))
removefunc = false;
}