[PATCH 3.16.y-ckt 010/129] ALSA: usb-audio: avoid freeing umidi object twice

[Luis Henriques]

3.16.7-ckt25 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Andrey Konovalov <andreyknvl@xxxxxxxxx>

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@xxxxxxxxx>
Acked-by: Clemens Ladisch <clemens@xxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Cc: Moritz Muehlenhoff <jmm@xxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
 sound/usb/midi.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index 70c97cc4574c..a160a6b110f5 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -2368,7 +2368,6 @@ 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;
 	}