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ALSA: hda - hdmi: Do not expose eld data when eld is invalid

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Previously, it was possible to read the eld data of the previous
monitor connected. This should not be allowed.

Also refactor the function slightly.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
David Henningsson 2013-02-19 16:11:23 +01:00 committed by Takashi Iwai
parent bbfd8a19b6
commit 68e03de985
1 changed files with 18 additions and 7 deletions
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25
sound/pci/hda/patch_hdmi.c
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@ -343,14 +343,16 @@ static int hdmi_eld_ctl_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
struct hdmi_spec *spec;
struct hdmi_spec *spec = codec->spec;
struct hdmi_eld *eld;
int pin_idx;
spec = codec->spec;
uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
pin_idx = kcontrol->private_value;
uinfo->count = spec->pins[pin_idx].sink_eld.eld_size;
eld = &spec->pins[pin_idx].sink_eld;
uinfo->count = eld->eld_valid ? eld->eld_size : 0;
return 0;
}
@ -359,14 +361,23 @@ static int hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
struct hdmi_spec *spec;
struct hdmi_spec *spec = codec->spec;
struct hdmi_eld *eld;
int pin_idx;
spec = codec->spec;
pin_idx = kcontrol->private_value;
eld = &spec->pins[pin_idx].sink_eld;
memcpy(ucontrol->value.bytes.data,
spec->pins[pin_idx].sink_eld.eld_buffer, ELD_MAX_SIZE);
if (eld->eld_size > ARRAY_SIZE(ucontrol->value.bytes.data)) {
snd_BUG();
return -EINVAL;
}
memset(ucontrol->value.bytes.data, 0,
ARRAY_SIZE(ucontrol->value.bytes.data));
if (eld->eld_valid)
memcpy(ucontrol->value.bytes.data, eld->eld_buffer,
eld->eld_size);
return 0;
}