Merge tag 'sound-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "The amount of the changes isn't as quite small as wished, nevertheless
  they are straight fixes that deserve merging to 4.14 final.

  Most of fixes are about ALSA core bugs spotted by fuzzer: a follow-up
  fix for the previous nested rwsem patch, a fix to avoid the resource
  hogs due to too many concurrent ALSA timer invocations, and a fix for
  a crash with SYSEX MIDI transfer over OSS sequencer emulation that is
  used by none but fuzzer.

  The rest are usual HD-audio and USB-audio device-specific quirks,
  which are safe to apply"

* tag 'sound-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda - fix headset mic problem for Dell machines with alc274
  ALSA: seq: Fix OSS sysex delivery in OSS emulation
  ALSA: seq: Avoid invalid lockdep class warning
  ALSA: timer: Limit max instances per timer
  ALSA: usb-audio: support new Amanero Combo384 firmware version

9 files changed, 97 insertions, 17 deletions

diff --git a/include/sound/seq_kernel.h b/include/sound/seq_kernel.h
index feb58d455560..4b9ee3009aa0 100644
--- a/include/sound/seq_kernel.h
+++ b/include/sound/seq_kernel.h
@@ -49,7 +49,8 @@ typedef union snd_seq_timestamp snd_seq_timestamp_t;
 #define SNDRV_SEQ_DEFAULT_CLIENT_EVENTS 200
 
 /* max delivery path length */
-#define SNDRV_SEQ_MAX_HOPS              10
+/* NOTE: this shouldn't be greater than MAX_LOCKDEP_SUBCLASSES */
+#define SNDRV_SEQ_MAX_HOPS              8
 
 /* max size of event size */
 #define SNDRV_SEQ_MAX_EVENT_LEN         0x3fffffff
diff --git a/include/sound/timer.h b/include/sound/timer.h
index c4d76ff056c6..7ae226ab6990 100644
--- a/include/sound/timer.h
+++ b/include/sound/timer.h
@@ -90,6 +90,8 @@ struct snd_timer {
         struct list_head ack_list_head;
         struct list_head sack_list_head; /* slow ack list head */
         struct tasklet_struct task_queue;
+        int max_instances;      /* upper limit of timer instances */
+        int num_instances;      /* current number of timer instances */
 };
 
 struct snd_timer_instance {
diff --git a/sound/core/hrtimer.c b/sound/core/hrtimer.c
index 1ac0c423903e..6e47b823bcaa 100644
--- a/sound/core/hrtimer.c
+++ b/sound/core/hrtimer.c
@@ -159,6 +159,7 @@ static int __init snd_hrtimer_init(void)
         timer->hw = hrtimer_hw;
         timer->hw.resolution = resolution;
         timer->hw.ticks = NANO_SEC / resolution;
+        timer->max_instances = 100; /* lower the limit */
 
         err = snd_timer_global_register(timer);
         if (err < 0) {
diff --git a/sound/core/seq/oss/seq_oss_midi.c b/sound/core/seq/oss/seq_oss_midi.c
index aaff9ee32695..b30b2139e3f0 100644
--- a/sound/core/seq/oss/seq_oss_midi.c
+++ b/sound/core/seq/oss/seq_oss_midi.c
@@ -612,9 +612,7 @@ send_midi_event(struct seq_oss_devinfo *dp, struct snd_seq_event *ev, struct seq
         if (!dp->timer->running)
                 len = snd_seq_oss_timer_start(dp->timer);
         if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {
-                if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) == SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
-                        snd_seq_oss_readq_puts(dp->readq, mdev->seq_device,
-                                               ev->data.ext.ptr, ev->data.ext.len);
+                snd_seq_oss_readq_sysex(dp->readq, mdev->seq_device, ev);
         } else {
                 len = snd_midi_event_decode(mdev->coder, msg, sizeof(msg), ev);
                 if (len > 0)
diff --git a/sound/core/seq/oss/seq_oss_readq.c b/sound/core/seq/oss/seq_oss_readq.c
index 046cb586fb2f..06b21226b4e7 100644
--- a/sound/core/seq/oss/seq_oss_readq.c
+++ b/sound/core/seq/oss/seq_oss_readq.c
@@ -118,6 +118,35 @@ snd_seq_oss_readq_puts(struct seq_oss_readq *q, int dev, unsigned char *data, in
 }
 
 /*
+ * put MIDI sysex bytes; the event buffer may be chained, thus it has
+ * to be expanded via snd_seq_dump_var_event().
+ */
+struct readq_sysex_ctx {
+        struct seq_oss_readq *readq;
+        int dev;
+};
+
+static int readq_dump_sysex(void *ptr, void *buf, int count)
+{
+        struct readq_sysex_ctx *ctx = ptr;
+
+        return snd_seq_oss_readq_puts(ctx->readq, ctx->dev, buf, count);
+}
+
+int snd_seq_oss_readq_sysex(struct seq_oss_readq *q, int dev,
+                            struct snd_seq_event *ev)
+{
+        struct readq_sysex_ctx ctx = {
+                .readq = q,
+                .dev = dev
+        };
+
+        if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
+                return 0;
+        return snd_seq_dump_var_event(ev, readq_dump_sysex, &ctx);
+}
+
+/*
  * copy an event to input queue:
  * return zero if enqueued
  */
diff --git a/sound/core/seq/oss/seq_oss_readq.h b/sound/core/seq/oss/seq_oss_readq.h
index f1463f1f449e..8d033ca2d23f 100644
--- a/sound/core/seq/oss/seq_oss_readq.h
+++ b/sound/core/seq/oss/seq_oss_readq.h
@@ -44,6 +44,8 @@ void snd_seq_oss_readq_delete(struct seq_oss_readq *q);
 void snd_seq_oss_readq_clear(struct seq_oss_readq *readq);
 unsigned int snd_seq_oss_readq_poll(struct seq_oss_readq *readq, struct file *file, poll_table *wait);
 int snd_seq_oss_readq_puts(struct seq_oss_readq *readq, int dev, unsigned char *data, int len);
+int snd_seq_oss_readq_sysex(struct seq_oss_readq *q, int dev,
+                            struct snd_seq_event *ev);
 int snd_seq_oss_readq_put_event(struct seq_oss_readq *readq, union evrec *ev);
 int snd_seq_oss_readq_put_timestamp(struct seq_oss_readq *readq, unsigned long curt, int seq_mode);
 int snd_seq_oss_readq_pick(struct seq_oss_readq *q, union evrec *rec);
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 6cdd04a45962..15e82a656d96 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -180,7 +180,7 @@ static void snd_timer_request(struct snd_timer_id *tid)
  *
  * call this with register_mutex down.
  */
-static void snd_timer_check_slave(struct snd_timer_instance *slave)
+static int snd_timer_check_slave(struct snd_timer_instance *slave)
 {
         struct snd_timer *timer;
         struct snd_timer_instance *master;
@@ -190,16 +190,21 @@ static void snd_timer_check_slave(struct snd_timer_instance *slave)
                 list_for_each_entry(master, &timer->open_list_head, open_list) {
                         if (slave->slave_class == master->slave_class &&
                             slave->slave_id == master->slave_id) {
+                                if (master->timer->num_instances >=
+                                    master->timer->max_instances)
+                                        return -EBUSY;
                                 list_move_tail(&slave->open_list,
                                                &master->slave_list_head);
+                                master->timer->num_instances++;
                                 spin_lock_irq(&slave_active_lock);
                                 slave->master = master;
                                 slave->timer = master->timer;
                                 spin_unlock_irq(&slave_active_lock);
-                                return;
+                                return 0;
                         }
                 }
         }
+        return 0;
 }
 
 /*
@@ -208,7 +213,7 @@ static void snd_timer_check_slave(struct snd_timer_instance *slave)
  *
  * call this with register_mutex down.
  */
-static void snd_timer_check_master(struct snd_timer_instance *master)
+static int snd_timer_check_master(struct snd_timer_instance *master)
 {
         struct snd_timer_instance *slave, *tmp;
 
@@ -216,7 +221,11 @@ static void snd_timer_check_master(struct snd_timer_instance *master)
         list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) {
                 if (slave->slave_class == master->slave_class &&
                     slave->slave_id == master->slave_id) {
+                        if (master->timer->num_instances >=
+                            master->timer->max_instances)
+                                return -EBUSY;
                         list_move_tail(&slave->open_list, &master->slave_list_head);
+                        master->timer->num_instances++;
                         spin_lock_irq(&slave_active_lock);
                         spin_lock(&master->timer->lock);
                         slave->master = master;
@@ -228,8 +237,11 @@ static void snd_timer_check_master(struct snd_timer_instance *master)
                         spin_unlock_irq(&slave_active_lock);
                 }
         }
+        return 0;