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author | Daniel Drake <drake@endlessm.com> | 2020-03-12 09:09:55 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-18 09:14:24 +0300 |
commit | 7967fef2c6aac905233eba29f047772f1392aefb (patch) | |
tree | ebaa412203a628ef95bd786fa7b8040132074f70 /drivers/i2c | |
parent | d51c65f835a9136dd9c1aa060ea5d58d72d09fe5 (diff) | |
download | linux-7967fef2c6aac905233eba29f047772f1392aefb.tar.xz |
iommu/vt-d: Ignore devices with out-of-spec domain number
commit da72a379b2ec0bad3eb265787f7008bead0b040c upstream.
VMD subdevices are created with a PCI domain ID of 0x10000 or
higher.
These subdevices are also handled like all other PCI devices by
dmar_pci_bus_notifier().
However, when dmar_alloc_pci_notify_info() take records of such devices,
it will truncate the domain ID to a u16 value (in info->seg).
The device at (e.g.) 10000:00:02.0 is then treated by the DMAR code as if
it is 0000:00:02.0.
In the unlucky event that a real device also exists at 0000:00:02.0 and
also has a device-specific entry in the DMAR table,
dmar_insert_dev_scope() will crash on:
BUG_ON(i >= devices_cnt);
That's basically a sanity check that only one PCI device matches a
single DMAR entry; in this case we seem to have two matching devices.
Fix this by ignoring devices that have a domain number higher than
what can be looked up in the DMAR table.
This problem was carefully diagnosed by Jian-Hong Pan.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Daniel Drake <drake@endlessm.com>
Fixes: 59ce0515cdaf3 ("iommu/vt-d: Update DRHD/RMRR/ATSR device scope caches when PCI hotplug happens")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/i2c')
0 files changed, 0 insertions, 0 deletions