ALSA: aloop: Sync stale timer before release

commit 67a01afaf3d34893cf7d2ea19b34555d6abb7cb0 upstream.

The aloop driver tries to stop the pending timer via timer_del() in
the trigger callback and in the close callback.  The former is
correct, as it's an atomic operation, while the latter expects that
the timer gets really removed and proceeds the resource releases after
that.  But timer_del() doesn't synchronize, hence the running timer
may still access the released resources.

A similar situation can be also seen in the prepare callback after
trigger(STOP) where the prepare tries to re-initialize the things
while a timer is still running.

The problems like the above are seen indirectly in some syzkaller
reports (although it's not 100% clear whether this is the only cause,
as the race condition is quite narrow and not always easy to
trigger).

For addressing these issues, this patch adds the explicit alls of
timer_del_sync() in some places, so that the pending timer is properly
killed / synced.

Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c
index cbd20cb8ca1127704b9448952f5d907e4a17432d..610d36bce2c2f1aca4124775460e4b1089c4ee53 100644 (file)
--- a/sound/drivers/aloop.c
+++ b/sound/drivers/aloop.c
@@ -192,6 +192,11 @@ static inline void loopback_timer_stop(struct loopback_pcm *dpcm)
        dpcm->timer.expires = 0;
 }
 
+static inline void loopback_timer_stop_sync(struct loopback_pcm *dpcm)
+{
+       del_timer_sync(&dpcm->timer);
+}
+
 #define CABLE_VALID_PLAYBACK   (1 << SNDRV_PCM_STREAM_PLAYBACK)
 #define CABLE_VALID_CAPTURE    (1 << SNDRV_PCM_STREAM_CAPTURE)
 #define CABLE_VALID_BOTH       (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE)
@@ -326,6 +331,8 @@ static int loopback_prepare(struct snd_pcm_substream *substream)
        struct loopback_cable *cable = dpcm->cable;
        int bps, salign;
 
+       loopback_timer_stop_sync(dpcm);
+
        salign = (snd_pcm_format_width(runtime->format) *
                                                runtime->channels) / 8;
        bps = salign * runtime->rate;
@@ -745,7 +752,7 @@ static int loopback_close(struct snd_pcm_substream *substream)
        struct loopback *loopback = substream->private_data;
        struct loopback_pcm *dpcm = substream->runtime->private_data;
 
-       loopback_timer_stop(dpcm);
+       loopback_timer_stop_sync(dpcm);
        mutex_lock(&loopback->cable_lock);
        free_cable(substream);
        mutex_unlock(&loopback->cable_lock);