[PATCH 5.15 067/128] ALSA: rawmidi - fix the uninitalized user_pversion

Greg Kroah-Hartman
2021-12-27T15:48:24Z

From: Jaroslav Kysela <perex@perex.cz>

commit 39a8fc4971a00d22536aeb7d446ee4a97810611b upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
sound/core/rawmidi.c | 1 +
1 file changed, 1 insertion(+)

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