linux-kernel - [PATCH 3.2 61/67] ALSA: usb-audio: avoid freeing umidi object twice

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Message-ID: <lsq.1456263723.767466805@decadent.org.uk>
Date:	Tue, 23 Feb 2016 21:42:03 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Takashi Iwai" <tiwai@...e.de>,
	"Andrey Konovalov" <andreyknvl@...il.com>,
	"Clemens Ladisch" <clemens@...isch.de>
Subject: [PATCH 3.2 61/67] ALSA: usb-audio: avoid freeing umidi object twice

3.2.78-rc1 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: Ben Hutchings <ben@...adent.org.uk>
---
 sound/usb/midi.c | 1 -
 1 file changed, 1 deletion(-)

--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -2289,7 +2289,6 @@ int snd_usbmidi_create(struct snd_card *
 	else
 		err = snd_usbmidi_create_endpoints(umidi, endpoints);
 	if (err < 0) {
-		snd_usbmidi_free(umidi);
 		return err;
 	}