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ALSA: seq: Check the conflicting port at port creation

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We didn't check if a port with the given port number has been already
present at creating a new port.  Check it and return -EBUSY properly
if the port number conflicts.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230523075358.9672-22-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-05-23 09:53:42 +02:00
parent 94c5b717ad
commit 7c3f0d3d3a
3 changed files with 27 additions and 15 deletions
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12
sound/core/seq/seq_clientmgr.c
View File

@ -1194,15 +1194,19 @@ static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
struct snd_seq_port_info *info = arg;
struct snd_seq_client_port *port;
struct snd_seq_port_callback *callback;
int port_idx;
int port_idx, err;
/* it is not allowed to create the port for an another client */
if (info->addr.client != client->number)
return -EPERM;
port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
if (port == NULL)
return -ENOMEM;
if (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT)
port_idx = info->addr.port;
else
port_idx = -1;
err = snd_seq_create_port(client, port_idx, &port);
if (err < 0)
return err;
if (client->type == USER_CLIENT && info->kernel) {
port_idx = port->addr.port;

25
sound/core/seq/seq_ports.c
View File

@ -107,33 +107,34 @@ static void port_subs_info_init(struct snd_seq_port_subs_info *grp)
}
/* create a port, port number is returned (-1 on failure);
/* create a port, port number or a negative error code is returned
* the caller needs to unref the port via snd_seq_port_unlock() appropriately
*/
struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client,
int port)
int snd_seq_create_port(struct snd_seq_client *client, int port,
struct snd_seq_client_port **port_ret)
{
struct snd_seq_client_port *new_port, *p;
int num = -1;
int num;
*port_ret = NULL;
/* sanity check */
if (snd_BUG_ON(!client))
return NULL;
return -EINVAL;
if (client->num_ports >= SNDRV_SEQ_MAX_PORTS) {
pr_warn("ALSA: seq: too many ports for client %d\n", client->number);
return NULL;
return -EINVAL;
}
/* create a new port */
new_port = kzalloc(sizeof(*new_port), GFP_KERNEL);
if (!new_port)
return NULL; /* failure, out of memory */
return -ENOMEM; /* failure, out of memory */
/* init port data */
new_port->addr.client = client->number;
new_port->addr.port = -1;
new_port->owner = THIS_MODULE;
sprintf(new_port->name, "port-%d", num);
snd_use_lock_init(&new_port->use_lock);
port_subs_info_init(&new_port->c_src);
port_subs_info_init(&new_port->c_dest);
@ -143,6 +144,10 @@ struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client,
mutex_lock(&client->ports_mutex);
write_lock_irq(&client->ports_lock);
list_for_each_entry(p, &client->ports_list_head, list) {
if (p->addr.port == port) {
num = -EBUSY;
goto unlock;
}
if (p->addr.port > num)
break;
if (port < 0) /* auto-probe mode */
@ -153,10 +158,12 @@ struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client,
client->num_ports++;
new_port->addr.port = num; /* store the port number in the port */
sprintf(new_port->name, "port-%d", num);
*port_ret = new_port;
unlock:
write_unlock_irq(&client->ports_lock);
mutex_unlock(&client->ports_mutex);
return new_port;
return num;
}
/* */

5
sound/core/seq/seq_ports.h
View File

@ -86,8 +86,9 @@ struct snd_seq_client_port *snd_seq_port_query_nearest(struct snd_seq_client *cl
/* unlock the port */
#define snd_seq_port_unlock(port) snd_use_lock_free(&(port)->use_lock)
/* create a port, port number is returned (-1 on failure) */
struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client, int port_index);
/* create a port, port number or a negative error code is returned */
int snd_seq_create_port(struct snd_seq_client *client, int port_index,
struct snd_seq_client_port **port_ret);
/* delete a port */
int snd_seq_delete_port(struct snd_seq_client *client, int port);