[PATCH] sound: initialize rawmidi substream list

[Akinobu Mita <akinobu.mita@gmail.com>]

If snd_rawmidi_new() failed to allocate substreams for input
(snd_rawmidi_alloc_substreams() failed to populate a 
&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]), it will try to
free rawmidi instance by snd_rawmidi_free().

But it will cause oops because snd_rawmidi_free() tries to free
both of substreams list but list for output
(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]) is not initialized yet.

Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jaroslav Kysela <perex@suse.cz>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>

 sound/core/rawmidi.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: work-fault-inject/sound/core/rawmidi.c
===================================================================
--- work-fault-inject.orig/sound/core/rawmidi.c
+++ work-fault-inject/sound/core/rawmidi.c
@@ -1379,7 +1379,6 @@ static int snd_rawmidi_alloc_substreams(
 	struct snd_rawmidi_substream *substream;
 	int idx;
 
-	INIT_LIST_HEAD(&stream->substreams);
 	for (idx = 0; idx < count; idx++) {
 		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 		if (substream == NULL) {
@@ -1434,6 +1433,9 @@ int snd_rawmidi_new(struct snd_card *car
 	rmidi->device = device;
 	mutex_init(&rmidi->open_mutex);
 	init_waitqueue_head(&rmidi->open_wait);
+	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
+	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
+
 	if (id != NULL)
 		strlcpy(rmidi->id, id, sizeof(rmidi->id));
 	if ((err = snd_rawmidi_alloc_substreams(rmidi,