Commit 9ced4235 authored by Takashi Iwai's avatar Takashi Iwai Committed by Ben Hutchings

ALSA: seq: Fix race at creating a queue

commit 4842e98f upstream.

When a sequencer queue is created in snd_seq_queue_alloc(),it adds the
new queue element to the public list before referencing it.  Thus the
queue might be deleted before the call of snd_seq_queue_use(), and it
results in the use-after-free error, as spotted by syzkaller.

The fix is to reference the queue object at the right time.
Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 44a2c426
......@@ -183,6 +183,8 @@ void __exit snd_seq_queues_delete(void)
}
}
static void queue_use(struct snd_seq_queue *queue, int client, int use);
/* allocate a new queue -
* return queue index value or negative value for error
*/
......@@ -194,11 +196,11 @@ int snd_seq_queue_alloc(int client, int locked, unsigned int info_flags)
if (q == NULL)
return -ENOMEM;
q->info_flags = info_flags;
queue_use(q, client, 1);
if (queue_list_add(q) < 0) {
queue_delete(q);
return -ENOMEM;
}
snd_seq_queue_use(q->queue, client, 1); /* use this queue */
return q->queue;
}
......@@ -504,19 +506,9 @@ int snd_seq_queue_timer_set_tempo(int queueid, int client,
return result;
}
/* use or unuse this queue -
* if it is the first client, starts the timer.
* if it is not longer used by any clients, stop the timer.
*/
int snd_seq_queue_use(int queueid, int client, int use)
/* use or unuse this queue */
static void queue_use(struct snd_seq_queue *queue, int client, int use)
{
struct snd_seq_queue *queue;
queue = queueptr(queueid);
if (queue == NULL)
return -EINVAL;
mutex_lock(&queue->timer_mutex);
if (use) {
if (!test_and_set_bit(client, queue->clients_bitmap))
queue->clients++;
......@@ -531,6 +523,21 @@ int snd_seq_queue_use(int queueid, int client, int use)
} else {
snd_seq_timer_close(queue);
}
}
/* use or unuse this queue -
* if it is the first client, starts the timer.
* if it is not longer used by any clients, stop the timer.
*/
int snd_seq_queue_use(int queueid, int client, int use)
{
struct snd_seq_queue *queue;
queue = queueptr(queueid);
if (queue == NULL)
return -EINVAL;
mutex_lock(&queue->timer_mutex);
queue_use(queue, client, use);
mutex_unlock(&queue->timer_mutex);
queuefree(queue);
return 0;
......
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