ALSA: hda: hdmi - fix kernel oops caused by invalid PCM idx

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Add additional check in hdmi_find_pcm_slot() to not return
a pcm index that points to unallocated pcm. This could happen
if codec driver is set up in codec->mst_no_extra_pcms mode.
On some platforms, this leads to a kernel oops in snd_ctl_notify(),
called via update_eld().

BugLink: https://github.com/thesofproject/linux/issues/1536
Fixes: 5398e94fb7 ALSA: hda - Add DP-MST support for NVIDIA codecs
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20191129143756.23941-1-kai.vehmanen@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Kai Vehmanen 2019-11-29 16:37:55 +02:00 • committed by Takashi Iwai

parent 336820c437

commit 0c0fe9e6b9

1 changed files with 11 additions and 11 deletions

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sound/pci/hda/patch_hdmi.c

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