tree 5109d844e69ee0f48e8575f487967a78cb8b9c3c
parent 0fca97a29b83e3f315c14ed2372cfd0f9ee0a006
author Takashi Iwai <tiwai@suse.de> 1531841203 +0200
committer Takashi Iwai <tiwai@suse.de> 1531841597 +0200

ALSA: rawmidi: Change resized buffers atomically

The SNDRV_RAWMIDI_IOCTL_PARAMS ioctl may resize the buffers and the
current code is racy.  For example, the sequencer client may write to
buffer while it being resized.

As a simple workaround, let's switch to the resized buffer inside the
stream runtime lock.

Reported-by: syzbot+52f83f0ea8df16932f7f@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>