linux-kernel - [PATCH 4.3 115/200] ALSA: seq: Fix race at closing in virmidi driver

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Message-Id: <20160214222221.539722457@linuxfoundation.org>
Date:	Sun, 14 Feb 2016 14:22:02 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
	Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 4.3 115/200] ALSA: seq: Fix race at closing in virmidi driver

4.3-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 2d1b5c08366acd46c35a2e9aba5d650cb5bf5c19 upstream.

The virmidi driver has an open race at closing its assigned rawmidi
device, and this may lead to use-after-free in
snd_seq_deliver_single_event().

Plug the hole by properly protecting the linked list deletion and
calling in the right order in snd_virmidi_input_close().

BugLink: http://lkml.kernel.org/r/CACT4Y+Zd66+w12fNN85-425cVQT=K23kWbhnCEcMB8s3us-Frw@mail.gmail.com
Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
Tested-by: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/core/seq/seq_virmidi.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/sound/core/seq/seq_virmidi.c
+++ b/sound/core/seq/seq_virmidi.c
@@ -261,9 +261,13 @@ static int snd_virmidi_output_open(struc
  */
 static int snd_virmidi_input_close(struct snd_rawmidi_substream *substream)
 {
+	struct snd_virmidi_dev *rdev = substream->rmidi->private_data;
 	struct snd_virmidi *vmidi = substream->runtime->private_data;
-	snd_midi_event_free(vmidi->parser);
+
+	write_lock_irq(&rdev->filelist_lock);
 	list_del(&vmidi->list);
+	write_unlock_irq(&rdev->filelist_lock);
+	snd_midi_event_free(vmidi->parser);
 	substream->runtime->private_data = NULL;
 	kfree(vmidi);
 	return 0;