diff options
| author | Petr Vandrovec <petr@vmware.com> | 2012-03-08 13:33:24 -0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2012-03-30 03:31:58 -0400 |
| commit | ac909ec308ce8d5177963c780564824d12bc3fa2 (patch) | |
| tree | 490e9168b304a93606de30fe01c9c5b0dc9fbc32 /security | |
| parent | c80f5b31f3c55a197f5323b93d1e3553429a427e (diff) | |
ACPI: Fix use-after-free in acpi_map_lsapic
When processor is being hot-added to the system, acpi_map_lsapic invokes
ACPI _MAT method to find APIC ID and flags, verifies that returned structure
is indeed ACPI's local APIC structure, and that flags contain MADT_ENABLED
bit. Then saves APIC ID, frees structure - and accesses structure when
computing arguments for acpi_register_lapic call. Which sometime leads
to acpi_register_lapic call being made with second argument zero, failing
to bring processor online with error 'Unable to map lapic to logical cpu
number'.
As lapic->lapic_flags & ACPI_MADT_ENABLED was already confirmed to be non-zero
few lines above, we can just pass unconditional ACPI_MADT_ENABLED to the
acpi_register_lapic.
Signed-off-by: Petr Vandrovec <petr@vmware.com>
Signed-off-by: Alok N Kataria <akataria@vmware.com>
Reviewed-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions