linux-kernel - [PATCH AUTOSEL for 4.4 050/162] ALSA: hda: Fix potential race at unregistration and unsol events

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Date:   Mon, 9 Apr 2018 00:28:18 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Takashi Iwai <tiwai@...e.de>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 050/162] ALSA: hda: Fix potential race at
 unregistration and unsol events

From: Takashi Iwai <tiwai@...e.de>

[ Upstream commit eb8d0eaaf84b0398533a7c091a0b65663f2fd7ea ]

When the codec device is unregistered / freed, it may release the
resource while being used in an unsolicited event like the jack
detection work.  This leads to use-after-free.

The fix here is to unregister the device at first, i.e. removing the
codec from the list, then flushing the pending works to assure that
all unsol events are gone.  After this point, we're free from
accessing the codec via unsol events, thus can release the resources
gracefully.

The issue was spotted originally by Intel CI, but it couldn't be
reproduced reliably by its nature.  So let's hope this fix really
addresses the whole issues.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=196045
Reported-by: Martin Peres <martin.peres@...e.fr>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 sound/hda/hdac_bus.c    | 1 +
 sound/hda/hdac_device.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/sound/hda/hdac_bus.c b/sound/hda/hdac_bus.c
index 0e81ea89a596..714a51721a31 100644
--- a/sound/hda/hdac_bus.c
+++ b/sound/hda/hdac_bus.c
@@ -212,5 +212,6 @@ void snd_hdac_bus_remove_device(struct hdac_bus *bus,
 	bus->caddr_tbl[codec->addr] = NULL;
 	clear_bit(codec->addr, &bus->codec_powered);
 	bus->num_codecs--;
+	flush_work(&bus->unsol_work);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_bus_remove_device);
diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c
index e361024eabb6..4a7400ae8af3 100644
--- a/sound/hda/hdac_device.c
+++ b/sound/hda/hdac_device.c
@@ -159,6 +159,7 @@ void snd_hdac_device_unregister(struct hdac_device *codec)
 	if (device_is_registered(&codec->dev)) {
 		hda_widget_sysfs_exit(codec);
 		device_del(&codec->dev);
+		snd_hdac_bus_remove_device(codec->bus, codec);
 	}
 }
 EXPORT_SYMBOL_GPL(snd_hdac_device_unregister);
-- 
2.15.1