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authorShanker Donthineni <shankerd@codeaurora.org>2016-04-06 12:49:24 -0500
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-04-07 01:25:28 +0200
commit169b38373fd4a7d47cac0e5fdeeae90b8c076f32 (patch)
tree1ed872b04c4eef0066efd80d7a92c591499c9850 /drivers/mailbox
parentf387e5b901adb8352fcdf031bb2c539e390b92e2 (diff)
downloadlinux-169b38373fd4a7d47cac0e5fdeeae90b8c076f32.tar.bz2
mailbox: pcc: Don't access an unmapped memory address space
The acpi_pcc_probe() may end up accessing memory outside of the PCCT table space causing the kernel panic(). Increment the pcct_entry pointer after parsing 'HW-reduced Communications Subspace' to fix the problem. This change also enables the parsing of subtable at index 0. Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org> Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/mailbox')
-rw-r--r--drivers/mailbox/pcc.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
index ac11a9b395d3..9d3955e6ab44 100644
--- a/drivers/mailbox/pcc.c
+++ b/drivers/mailbox/pcc.c
@@ -367,8 +367,6 @@ static int __init acpi_pcc_probe(void)
struct acpi_generic_address *db_reg;
struct acpi_pcct_hw_reduced *pcct_ss;
pcc_mbox_channels[i].con_priv = pcct_entry;
- pcct_entry = (struct acpi_subtable_header *)
- ((unsigned long) pcct_entry + pcct_entry->length);
/* If doorbell is in system memory cache the virt address */
pcct_ss = (struct acpi_pcct_hw_reduced *)pcct_entry;
@@ -376,6 +374,8 @@ static int __init acpi_pcc_probe(void)
if (db_reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
pcc_doorbell_vaddr[i] = acpi_os_ioremap(db_reg->address,
db_reg->bit_width/8);
+ pcct_entry = (struct acpi_subtable_header *)
+ ((unsigned long) pcct_entry + pcct_entry->length);
}
pcc_mbox_ctrl.num_chans = count;