Commit c37a3c94 authored by Dan Carpenter's avatar Dan Carpenter Committed by Boris Ostrovsky

xen/acpi: off by one in read_acpi_id()

If acpi_id is == nr_acpi_bits, then we access one element beyond the end
of the acpi_psd[] array or we set one bit beyond the end of the bit map
when we do __set_bit(acpi_id, acpi_id_present);

Fixes: 59a56802 ("xen/acpi-processor: C and P-state driver that uploads said data to hypervisor.")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: default avatarJoao Martins <joao.m.martins@oracle.com>
Reviewed-by: default avatarJuergen Gross <jgross@suse.com>
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent 4d0f1ce6
...@@ -364,9 +364,9 @@ read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv) ...@@ -364,9 +364,9 @@ read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv)
} }
/* There are more ACPI Processor objects than in x2APIC or MADT. /* There are more ACPI Processor objects than in x2APIC or MADT.
* This can happen with incorrect ACPI SSDT declerations. */ * This can happen with incorrect ACPI SSDT declerations. */
if (acpi_id > nr_acpi_bits) { if (acpi_id >= nr_acpi_bits) {
pr_debug("We only have %u, trying to set %u\n", pr_debug("max acpi id %u, trying to set %u\n",
nr_acpi_bits, acpi_id); nr_acpi_bits - 1, acpi_id);
return AE_OK; return AE_OK;
} }
/* OK, There is a ACPI Processor object */ /* OK, There is a ACPI Processor object */
......
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