diff options
| author | Takashi Iwai <tiwai@suse.de> | 2020-02-14 15:49:28 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-02-14 15:51:35 +0100 |
| commit | e9a0ef0b5ddcbc0d56c65aefc0f18d16e6f71207 (patch) | |
| tree | 981b6308930c35fd89be925edff71b1e984de1f0 /sound/usb | |
| parent | bb80b96422b443ddcb6dbb39261ea3e02a13661d (diff) | |
| download | linux-e9a0ef0b5ddcbc0d56c65aefc0f18d16e6f71207.tar.bz2 | |
ALSA: usb-audio: Don't create a mixer element with bogus volume range
Some USB-audio descriptors provide a bogus volume range (e.g. volume
min and max are identical), which confuses user-space.
This patch makes the driver skipping such a control element.
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=206221
Link: https://lore.kernel.org/r/20200214144928.23628-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/mixer.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index d659fdb475e2..96e20488804d 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1666,6 +1666,16 @@ static void __build_feature_ctl(struct usb_mixer_interface *mixer, /* get min/max values */ get_min_max_with_quirks(cval, 0, kctl); + /* skip a bogus volume range */ + if (cval->max <= cval->min) { + usb_audio_dbg(mixer->chip, + "[%d] FU [%s] skipped due to invalid volume\n", + cval->head.id, kctl->id.name); + snd_ctl_free_one(kctl); + return; + } + + if (control == UAC_FU_VOLUME) { check_mapped_dB(map, cval); if (cval->dBmin < cval->dBmax || !cval->initialized) { |