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ALSA: seq: Prohibit creating ports with special numbers

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Some port numbers are special, such as 254 for subscribers and 255 for
broadcast.  Return error if application tries to create such a port.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230523075358.9672-24-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-05-23 09:53:44 +02:00
parent 4f92eb792e
commit 1359905383
1 changed files with 2 additions and 0 deletions
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2
sound/core/seq/seq_clientmgr.c
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@ -1206,6 +1206,8 @@ static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
port_idx = info->addr.port;
else
port_idx = -1;
if (port_idx >= SNDRV_SEQ_ADDRESS_UNKNOWN)
return -EINVAL;
err = snd_seq_create_port(client, port_idx, &port);
if (err < 0)
return err;