From 39a8fc4971a00d22536aeb7d446ee4a97810611b Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Sat, 18 Dec 2021 13:39:25 +0100
Subject: [PATCH] ALSA: rawmidi - fix the uninitalized user_pversion
Git-commit: 39a8fc4971a00d22536aeb7d446ee4a97810611b
Patch-mainline: v5.16-rc7
References: git-fixes

The user_pversion was uninitialized 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@kernel.org
Cc: broonie@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@syzkaller.appspotmail.com
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20211218123925.2583847-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 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