There is an implicit rule to map between pin NID and port number on Intel HDMI/DP codec: the mapping is fixed only for NID 0x05, 0x06 and 0x07. For avoiding the possible memory corruption, add a sanity check for the NID value and splat WARN_ON() for invalid accesses.

Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/hda/hdac_i915.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c index f6854dbd7d8d..fb96aead8257 100644 --- a/sound/hda/hdac_i915.c +++ b/sound/hda/hdac_i915.c @@ -126,6 +126,8 @@ EXPORT_SYMBOL_GPL(snd_hdac_get_display_clk); */ static int pin2port(hda_nid_t pin_nid) { + if (WARN_ON(pin_nid < 5 || pin_nid > 7)) + return -1; return pin_nid - 4; }

@@ -144,10 +146,14 @@ static int pin2port(hda_nid_t pin_nid) int snd_hdac_sync_audio_rate(struct hdac_bus *bus, hda_nid_t nid, int rate) { struct i915_audio_component *acomp = bus->audio_component; + int port;

if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate) return -ENODEV; - return acomp->ops->sync_audio_rate(acomp->dev, pin2port(nid), rate); + port = pin2port(nid); + if (port < 0) + return -EINVAL; + return acomp->ops->sync_audio_rate(acomp->dev, port, rate); } EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);

@@ -175,11 +181,15 @@ int snd_hdac_acomp_get_eld(struct hdac_bus *bus, hda_nid_t nid, bool *audio_enabled, char *buffer, int max_bytes) { struct i915_audio_component *acomp = bus->audio_component; + int port;

if (!acomp || !acomp->ops || !acomp->ops->get_eld) return -ENODEV;

- return acomp->ops->get_eld(acomp->dev, pin2port(nid), audio_enabled, + port = pin2port(nid); + if (port < 0) + return -EINVAL; + return acomp->ops->get_eld(acomp->dev, port, audio_enabled, buffer, max_bytes); } EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);