[PATCH] ALSA: rawmidi - fix the uninitalized user_pversion

[Jaroslav Kysela]

The user_pversion was unitialized for the user space file structure
in the open function, because the file private structure use
kmalloc for the allocation.

The kernel ALSA sequencer code clears the file structure, so no additional
fixes are required.

Cc: stable at kernel.org
Cc: broonie at kernel.org
BugLink: https://github.com/alsa-project/alsa-lib/issues/178
Fixes: 09d23174402d ("ALSA: rawmidi: introduce SNDRV_RAWMIDI_IOCTL_USER_PVERSION")
Reported-by: syzbot+88412ee8811832b00dbe at syzkaller.appspotmail.com
Signed-off-by: Jaroslav Kysela <perex at perex.cz>
---
 sound/core/rawmidi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 6f30231bdb88..befa9809ff00 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -447,6 +447,7 @@ static int snd_rawmidi_open(struct inode *inode, struct file *file)
 		err = -ENOMEM;
 		goto __error;
 	}
+	rawmidi_file->user_pversion = 0;
 	init_waitqueue_entry(&wait, current);
 	add_wait_queue(&rmidi->open_wait, &wait);
 	while (1) {
-- 
2.31.1