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authorDavid Henningsson <david.henningsson@canonical.com>2013-02-19 16:11:23 +0100
committerTakashi Iwai <tiwai@suse.de>2013-02-19 18:28:13 +0100
commit68e03de98507065bb5fd1958388974c9bc2cd480 (patch)
treed6ed5311465005647b4d2ab2bce0d396e422032d /sound
parentbbfd8a19b6913f50a362457c34d49bfafe5e456e (diff)
downloadlinaro-lsk-68e03de98507065bb5fd1958388974c9bc2cd480.tar.gz
ALSA: hda - hdmi: Do not expose eld data when eld is invalid
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/hda/patch_hdmi.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 32adaa6c562..6bcdd667f51 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -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;
+
+ if (eld->eld_size > ARRAY_SIZE(ucontrol->value.bytes.data)) {
+ snd_BUG();
+ return -EINVAL;
+ }
- memcpy(ucontrol->value.bytes.data,
- spec->pins[pin_idx].sink_eld.eld_buffer, ELD_MAX_SIZE);
+ 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;
}