diff options
author | Takashi Iwai <tiwai@suse.de> | 2017-11-17 12:08:40 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-30 08:39:05 +0000 |
commit | af9642d85915920271256dab4bba0a70a21618f7 (patch) | |
tree | b33ddb03d74a9bfc977f7fa20ab6f166fe2f05c9 /sound/pci | |
parent | 162799dbd76ec86fed4b3b2d8e87f012424407c8 (diff) |
ALSA: hda: Fix too short HDMI/DP chmap reporting
commit c2432466f583cb719b35a41e757da587d9ab1d00 upstream.
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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/pci')
0 files changed, 0 insertions, 0 deletions