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ALSA: seq: Check UMP support for midi_version change

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commit 8765429279 upstream.

When the kernel is built without UMP support but a user-space app
requires the midi_version > 0, the kernel should return an error.
Otherwise user-space assumes as if it were possible to deal,
eventually hitting serious errors later.

Fixes: 46397622a3 ("ALSA: seq: Add UMP support")
Cc: <stable@vger.kernel.org>
Link: https://patch.msgid.link/20241231145358.21946-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai
2024-12-31 15:53:58 +01:00
committed by Greg Kroah-Hartman
parent 199f045287
commit 396964d45c
1 changed files with 10 additions and 4 deletions
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sound/core/seq/seq_clientmgr.c
+10 -4
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@@ -1280,10 +1280,16 @@ static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
if (client->type != client_info->type)
return -EINVAL;
/* check validity of midi_version field */
if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3) &&
client_info->midi_version > SNDRV_SEQ_CLIENT_UMP_MIDI_2_0)
return -EINVAL;
if (client->user_pversion >= SNDRV_PROTOCOL_VERSION(1, 0, 3)) {
/* check validity of midi_version field */
if (client_info->midi_version > SNDRV_SEQ_CLIENT_UMP_MIDI_2_0)
return -EINVAL;
/* check if UMP is supported in kernel */
if (!IS_ENABLED(CONFIG_SND_SEQ_UMP) &&
client_info->midi_version > 0)
return -EINVAL;
}
/* fill the info fields */
if (client_info->name[0])