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ALSA: rawmidi: Change resized buffers atomically
authorTakashi Iwai <tiwai@suse.de>
Tue, 17 Jul 2018 15:26:43 +0000 (17:26 +0200)
committerTakashi Iwai <tiwai@suse.de>
Tue, 17 Jul 2018 15:33:17 +0000 (17:33 +0200)
commit39675f7a7c7e7702f7d5341f1e0d01db746543a0
tree5109d844e69ee0f48e8575f487967a78cb8b9c3ctree | snapshot
parent0fca97a29b83e3f315c14ed2372cfd0f9ee0a006commit | diff
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>
sound/core/rawmidi.c diff | blob | history
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