diff options
author | Takashi Iwai <tiwai@suse.de> | 2017-11-17 12:08:40 +0100 |
---|---|---|
committer | Takashi Iwai <tiwai@suse.de> | 2017-11-17 12:20:37 +0100 |
commit | c2432466f583cb719b35a41e757da587d9ab1d00 (patch) | |
tree | 29ca04ca9af299114aec7fd112e7d83eb59ae153 | |
parent | ALSA: usb-audio: uac1: Invalidate ctl on interrupt (diff) | |
download | linux-c2432466f583cb719b35a41e757da587d9ab1d00.tar.xz linux-c2432466f583cb719b35a41e757da587d9ab1d00.zip |
ALSA: hda: Fix too short HDMI/DP chmap reporting
We got a regression report about the HD-audio HDMI chmap, where some
surround channels are reported as UNKNOWN. The git bisection pointed
the culprit at the commit 9b3dc8aa3fb1 ("ALSA: hda - Register chmap
obj as priv data instead of codec"). The story behind scene is like
this:
- While moving the code out of the legacy HDA to the HDA common place,
the patch modifies the code to obtain the chmap array indirectly in
a byte array, and it expands it to kctl value array.
- At the latter operation, the size of the array is wrongly passed by
sizeof() to the pointer.
- It can be 4 on 32bit arch, thus too short for 6+ channels.
(And that's the reason why it didn't hit other persons; it's 8 on
64bit arch, thus it's usually enough.)
The code was further changed meanwhile, but the problem persisted.
Let's fix it by correctly evaluating the array size.
Fixes: 9b3dc8aa3fb1 ("ALSA: hda - Register chmap obj as priv data instead of codec")
Reported-by: VDR User <user.vdr@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r-- | sound/hda/hdmi_chmap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/hda/hdmi_chmap.c b/sound/hda/hdmi_chmap.c index 81acc20c2535..f21633cd9b38 100644 --- a/sound/hda/hdmi_chmap.c +++ b/sound/hda/hdmi_chmap.c @@ -746,7 +746,7 @@ static int hdmi_chmap_ctl_get(struct snd_kcontrol *kcontrol, memset(pcm_chmap, 0, sizeof(pcm_chmap)); chmap->ops.get_chmap(chmap->hdac, pcm_idx, pcm_chmap); - for (i = 0; i < sizeof(chmap); i++) + for (i = 0; i < ARRAY_SIZE(pcm_chmap); i++) ucontrol->value.integer.value[i] = pcm_chmap[i]; return 0; |