From 95b901dc34cf04c634e053d401d7ea8d314e738b Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 6 Aug 2024 14:46:50 +0200 Subject: [PATCH] ALSA: usb-audio: Add input value sanity checks for standard types [ Upstream commit 901e85677ec0bb9a69fb9eab1feafe0c4eb7d07e ] For an invalid input value that is out of the given range, currently USB-audio driver corrects the value silently and accepts without errors. This is no wrong behavior, per se, but the recent kselftest rather wants to have an error in such a case, hence a different behavior is expected now. This patch adds a sanity check at each control put for the standard mixer types and returns an error if an invalid value is given. Note that this covers only the standard mixer types. The mixer quirks that have own control callbacks would need different coverage. Link: https://patch.msgid.link/20240806124651.28203-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/usb/mixer.c | 35 +++++++++++++++++++++++++++-------- sound/usb/mixer.h | 1 + 2 files changed, 28 insertions(+), 8 deletions(-) diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 34ded71cb807..49facdf35b15 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1377,6 +1377,19 @@ no_res_check: #define get_min_max(cval, def) get_min_max_with_quirks(cval, def, NULL) +/* get the max value advertised via control API */ +static int get_max_exposed(struct usb_mixer_elem_info *cval) +{ + if (!cval->max_exposed) { + if (cval->res) + cval->max_exposed = + DIV_ROUND_UP(cval->max - cval->min, cval->res); + else + cval->max_exposed = cval->max - cval->min; + } + return cval->max_exposed; +} + /* get a feature/mixer unit info */ static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) @@ -1389,11 +1402,8 @@ static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, else uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = cval->channels; - if (cval->val_type == USB_MIXER_BOOLEAN || - cval->val_type == USB_MIXER_INV_BOOLEAN) { - uinfo->value.integer.min = 0; - uinfo->value.integer.max = 1; - } else { + if (cval->val_type != USB_MIXER_BOOLEAN && + cval->val_type != USB_MIXER_INV_BOOLEAN) { if (!cval->initialized) { get_min_max_with_quirks(cval, 0, kcontrol); if (cval->initialized && cval->dBmin >= cval->dBmax) { @@ -1405,10 +1415,10 @@ static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, &kcontrol->id); } } - uinfo->value.integer.min = 0; - uinfo->value.integer.max = - DIV_ROUND_UP(cval->max - cval->min, cval->res); } + + uinfo->value.integer.min = 0; + uinfo->value.integer.max = get_max_exposed(cval); return 0; } @@ -1449,6 +1459,7 @@ static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct usb_mixer_elem_info *cval = kcontrol->private_data; + int max_val = get_max_exposed(cval); int c, cnt, val, oval, err; int changed = 0; @@ -1461,6 +1472,8 @@ static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, if (err < 0) return filter_error(cval, err); val = ucontrol->value.integer.value[cnt]; + if (val < 0 || val > max_val) + return -EINVAL; val = get_abs_value(cval, val); if (oval != val) { snd_usb_set_cur_mix_value(cval, c + 1, cnt, val); @@ -1474,6 +1487,8 @@ static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, if (err < 0) return filter_error(cval, err); val = ucontrol->value.integer.value[0]; + if (val < 0 || val > max_val) + return -EINVAL; val = get_abs_value(cval, val); if (val != oval) { snd_usb_set_cur_mix_value(cval, 0, 0, val); @@ -2339,6 +2354,8 @@ static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol, if (err < 0) return filter_error(cval, err); val = ucontrol->value.integer.value[0]; + if (val < 0 || val > get_max_exposed(cval)) + return -EINVAL; val = get_abs_value(cval, val); if (val != oval) { set_cur_ctl_value(cval, cval->control << 8, val); @@ -2701,6 +2718,8 @@ static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, if (err < 0) return filter_error(cval, err); val = ucontrol->value.enumerated.item[0]; + if (val < 0 || val >= cval->max) /* here cval->max = # elements */ + return -EINVAL; val = get_abs_value(cval, val); if (val != oval) { set_cur_ctl_value(cval, cval->control << 8, val); diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h index d43895c1ae5c..167fbfcf01ac 100644 --- a/sound/usb/mixer.h +++ b/sound/usb/mixer.h @@ -88,6 +88,7 @@ struct usb_mixer_elem_info { int channels; int val_type; int min, max, res; + int max_exposed; /* control API exposes the value in 0..max_exposed */ int dBmin, dBmax; int cached; int cache_val[MAX_CHANNELS];