Hello David Henningsson,

The patch 68e03de98507: "ALSA: hda - hdmi: Do not expose eld data when eld is invalid" from Feb 19, 2013, leads to the following static checker warning:

sound/pci/hda/patch_hdmi.c:460 hdmi_eld_ctl_get() error: __memcpy() 'eld->eld_buffer' too small (256 vs 512)

sound/pci/hda/patch_hdmi.c 437 static int hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol, 438 struct snd_ctl_elem_value *ucontrol) 439 { 440 struct hda_codec *codec = snd_kcontrol_chip(kcontrol); 441 struct hdmi_spec *spec = codec->spec; 442 struct hdmi_spec_per_pin *per_pin; 443 struct hdmi_eld *eld; 444 int pin_idx; 445 446 pin_idx = kcontrol->private_value; 447 per_pin = get_pin(spec, pin_idx); 448 eld = &per_pin->sink_eld; 449 450 mutex_lock(&per_pin->lock); 451 if (eld->eld_size > ARRAY_SIZE(ucontrol->value.bytes.data)) {

In the original code we always copied ELD_MAX_SIZE (256) bytes. Now it looks like we can copy up to 512 bytes which seems like an information leak. I don't know where eld->eld_size is set so I can't say if this is a real issue or not. Perhaps it's always a valid value.

452 mutex_unlock(&per_pin->lock); 453 snd_BUG(); 454 return -EINVAL; 455 } 456 457 memset(ucontrol->value.bytes.data, 0, 458 ARRAY_SIZE(ucontrol->value.bytes.data)); 459 if (eld->eld_valid) 460 memcpy(ucontrol->value.bytes.data, eld->eld_buffer, 461 eld->eld_size); 462 mutex_unlock(&per_pin->lock); 463 464 return 0; 465 }

regards, dan carpenter