linux-kernel - [PATCH 4.4 028/117] ALSA: usb-audio: avoid freeing umidi object twice

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Message-Id: <20160214222142.245668221@linuxfoundation.org>
Date:	Sun, 14 Feb 2016 14:21:05 -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, Andrey Konovalov <andreyknvl@...il.com>,
	Clemens Ladisch <clemens@...isch.de>,
	Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 4.4 028/117] ALSA: usb-audio: avoid freeing umidi object twice

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

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

From: Andrey Konovalov <andreyknvl@...il.com>

commit 07d86ca93db7e5cdf4743564d98292042ec21af7 upstream.

The 'umidi' object will be free'd on the error path by snd_usbmidi_free()
when tearing down the rawmidi interface. So we shouldn't try to free it
in snd_usbmidi_create() after having registered the rawmidi interface.

Found by KASAN.

Signed-off-by: Andrey Konovalov <andreyknvl@...il.com>
Acked-by: Clemens Ladisch <clemens@...isch.de>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/usb/midi.c |    1 -
 1 file changed, 1 deletion(-)

--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -2454,7 +2454,6 @@ int snd_usbmidi_create(struct snd_card *
 	else
 		err = snd_usbmidi_create_endpoints(umidi, endpoints);
 	if (err < 0) {
-		snd_usbmidi_free(umidi);
 		return err;
 	}