linux-kernel - [PATCH] midi: avoid freeing umidi object twice

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Date:	Sat, 13 Feb 2016 11:08:06 +0300
From:	Andrey Konovalov <andreyknvl@...il.com>
To:	Clemens Ladisch <clemens@...isch.de>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Cc:	dvyukov@...gle.com, kcc@...gle.com, glider@...gle.com,
	Andrey Konovalov <andreyknvl@...il.com>
Subject: [PATCH] midi: avoid freeing umidi object twice

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.

Acked-by: Clemens Ladisch <clemens@...isch.de>
Signed-off-by: Andrey Konovalov <andreyknvl@...il.com>
---
 sound/usb/midi.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index cc39f63..007cf58 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -2455,7 +2455,6 @@ int snd_usbmidi_create(struct snd_card *card,
 	else
 		err = snd_usbmidi_create_endpoints(umidi, endpoints);
 	if (err < 0) {
-		snd_usbmidi_free(umidi);
 		return err;
 	}
 
-- 
1.9.1