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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2018-03-29 12:01:53 +0300 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2018-03-30 18:30:13 +0300 |
| commit | c37a3c94775855567b90f91775b9691e10bd2806 (patch) | |
| tree | ffec56d7af62bc785c7346f201759934dee0a784 /drivers/xen | |
| parent | 4d0f1ce6955913c490263359eadd392574cf9fe3 (diff) | |
| download | linux-c37a3c94775855567b90f91775b9691e10bd2806.tar.xz | |
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: 59a568029181 ("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>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/xen-acpi-processor.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c index c80195e8fbd1..b29f4e40851f 100644 --- a/drivers/xen/xen-acpi-processor.c +++ b/drivers/xen/xen-acpi-processor.c @@ -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. * 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 */ |