diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2018-03-29 12:01:53 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 07:50:42 +0200 |
| commit | f22984237aa3d433a16317c4253ee951d3aab2ba (patch) | |
| tree | ea851a33bfc048dfb1b4c8eacc3a6571bde675b0 /drivers/xen | |
| parent | 34f0516b709826c9210ad7e662a47fbef32ce3a1 (diff) | |
xen/acpi: off by one in read_acpi_id()
[ Upstream commit c37a3c94775855567b90f91775b9691e10bd2806 ]
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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 4b857463a2b4..7ff9d25f714e 100644 --- a/drivers/xen/xen-acpi-processor.c +++ b/drivers/xen/xen-acpi-processor.c @@ -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 */ |