static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
				       void *arg)
{
	struct snd_seq_remove_events *info = arg;

	/*
	 * Input mostly not implemented XXX.
	 */
	if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
		/*
		 * No restrictions so for a user client we can clear
		 * the whole fifo
		 */
		if (client->type == USER_CLIENT && client->data.user.fifo)
			snd_seq_fifo_clear(client->data.user.fifo);
	}

	if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
		snd_seq_queue_remove_cells(client->number, info);

	return 0;
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.