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| author | Lukas Wunner <lukas@wunner.de> | 2019-12-10 14:39:50 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-12-10 18:20:31 +0100 |
| commit | 6e8aeda224c83c7c7841e143d410b6d0e7bda05e (patch) | |
| tree | 9f551ea0ba21c2e4e54f614e739fc2acb2bd9543 /sound | |
| parent | 480136343cbe89426d6c2ab74ffb4e3ee572c7ee (diff) | |
| download | lwn-6e8aeda224c83c7c7841e143d410b6d0e7bda05e.tar.gz lwn-6e8aeda224c83c7c7841e143d410b6d0e7bda05e.zip | |
ALSA: hda/hdmi - Fix duplicate unref of pci_dev
Nicholas Johnson reports a null pointer deref as well as a refcount
underflow upon hot-removal of a Thunderbolt-attached AMD eGPU.
He's bisected the issue down to commit 586bc4aab878 ("ALSA: hda/hdmi -
fix vgaswitcheroo detection for AMD").
The commit iterates over PCI devices using pci_get_class() and
unreferences each device found, even though pci_get_class()
subsequently unreferences the device as well. Fix it.
Fixes: 586bc4aab878 ("ALSA: hda/hdmi - fix vgaswitcheroo detection for AMD")
Link: https://lore.kernel.org/r/PSXP216MB0438BFEAA0617283A834E11580580@PSXP216MB0438.KORP216.PROD.OUTLOOK.COM/
Reported-and-tested-by: Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Alexander Deucher <alexander.deucher@amd.com>
Cc: Bjorn Helgaas <helgaas@kernel.org>
Link: https://lore.kernel.org/r/77aa6c01aefe1ebc4004e87b0bc714f2759f15c4.1575985006.git.lukas@wunner.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/hda/hda_intel.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 35b4526f0d28..b856b89378ac 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -1419,7 +1419,6 @@ static bool atpx_present(void) return true; } } - pci_dev_put(pdev); } return false; } |