linux-kernel - [PATCH 2.6.32 51/55] ALSA: usb-audio: avoid freeing umidi object twice

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Message-Id: <20160304153002.942432454@1wt.eu>
Date:	Fri, 04 Mar 2016 16:30:51 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Andrey Konovalov <andreyknvl@...il.com>,
	Clemens Ladisch <clemens@...isch.de>,
	Takashi Iwai <tiwai@...e.de>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 51/55] ALSA: usb-audio: avoid freeing umidi object twice

2.6.32-longterm 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>
[wt: file is sound/midi/usbmidi.c in 2.6.32]
Signed-off-by: Willy Tarreau <w@....eu>
---
 sound/usb/usbmidi.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 64d8d2e..366020a 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -1947,7 +1947,6 @@ int snd_usb_create_midi_interface(struct snd_usb_audio* chip,
 	else
 		err = snd_usbmidi_create_endpoints(umidi, endpoints);
 	if (err < 0) {
-		snd_usbmidi_free(umidi);
 		return err;
 	}
 
-- 
1.7.12.2.21.g234cd45.dirty