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xen/acpi: off by one in read_acpi_id()

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[ Upstream commit c37a3c9477 ]

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: 59a5680291 ("xen/acpi-processor: C and P-state driver that uploads said data to hypervisor.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2018-03-29 12:01:53 +03:00 committed by Greg Kroah-Hartman
parent 637b9b187f
commit 8effa2182d
1 changed files with 3 additions and 3 deletions
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6
drivers/xen/xen-acpi-processor.c
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@ -362,9 +362,9 @@ read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv)
}
/* There are more ACPI Processor objects than in x2APIC or MADT.
* This can happen with incorrect ACPI SSDT declerations. */
if (acpi_id > nr_acpi_bits) {
pr_debug("We only have %u, trying to set %u\n",
nr_acpi_bits, acpi_id);
if (acpi_id >= nr_acpi_bits) {
pr_debug("max acpi id %u, trying to set %u\n",
nr_acpi_bits - 1, acpi_id);
return AE_OK;
}
/* OK, There is a ACPI Processor object */