On Tue, Dec 10, 2019 at 02:39:50PM +0100, Lukas Wunner wrote:
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@PSXP216MB04... Reported-and-tested-by: Nicholas Johnson nicholas.johnson-opensource@outlook.com.au Signed-off-by: Lukas Wunner lukas@wunner.de Cc: Mika Westerberg mika.westerberg@linux.intel.com Cc: Alexander Deucher alexander.deucher@amd.com Cc: Bjorn Helgaas helgaas@kernel.org
sound/pci/hda/hda_intel.c | 1 - 1 file changed, 1 deletion(-)
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);}
2.24.0
Extremely fast turnaround from bisect to patch.
If you want the bugzilla.kernel.org report then I can do that ASAP, but I feel that it is redundant now.
Thank you for handling my bug report.
Regards, Nicholas