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| author | Kai Vehmanen <kai.vehmanen@linux.intel.com> | 2020-10-13 18:26:28 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-02 10:48:08 +0300 |
| commit | 3afe38f6c3c6525d529db8e0fee89d1ad1fc345d (patch) | |
| tree | c5625486227e8359eed5d1ba213bdc050919db07 /drivers | |
| parent | 72289dc23c3c6311d21d87eee55278aa4308a73e (diff) | |
| download | linux-3afe38f6c3c6525d529db8e0fee89d1ad1fc345d.tar.xz | |
ALSA: hda/hdmi: fix incorrect locking in hdmi_pcm_close
commit ce1558c285f9ad04c03b46833a028230771cc0a7 upstream
A race exists between closing a PCM and update of ELD data. In
hdmi_pcm_close(), hinfo->nid value is modified without taking
spec->pcm_lock. If this happens concurrently while processing an ELD
update in hdmi_pcm_setup_pin(), converter assignment may be done
incorrectly.
This bug was found by hitting a WARN_ON in snd_hda_spdif_ctls_assign()
in a HDMI receiver connection stress test:
[2739.684569] WARNING: CPU: 5 PID: 2090 at sound/pci/hda/patch_hdmi.c:1898 check_non_pcm_per_cvt+0x41/0x50 [snd_hda_codec_hdmi]
...
[2739.684707] Call Trace:
[2739.684720] update_eld+0x121/0x5a0 [snd_hda_codec_hdmi]
[2739.684736] hdmi_present_sense+0x21e/0x3b0 [snd_hda_codec_hdmi]
[2739.684750] check_presence_and_report+0x81/0xd0 [snd_hda_codec_hdmi]
[2739.684842] intel_audio_codec_enable+0x122/0x190 [i915]
Fixes: 42b2987079ec ("ALSA: hda - hdmi playback without monitor in dynamic pcm bind mode")
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20201013152628.920764-1-kai.vehmanen@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
[sudip: adjust context]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions