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Bugzilla: 1090746
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Upstream-status: Queued for 3.15 and CC'd to stable
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From 2bb09843fc720389082ce7834b2716254bdf6c2d Mon Sep 17 00:00:00 2001
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Message-Id: <2bb09843fc720389082ce7834b2716254bdf6c2d.1397794898.git.lv.zheng@intel.com>
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From: Lv Zheng <lv.zheng@intel.com>
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Date: Fri, 18 Apr 2014 12:21:34 +0800
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Subject: [PATCH] ACPICA: Tables: Fix a bad pointer issue in
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acpi_tb_parse_root_table().
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The following is a linuxizing generation of the ACPICA commit to back ports
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Linux XSDT validation mechanism to ACPICA:
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Commit: 671cc68dc61f029d44b43a681356078e02d8dab8
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Subject: ACPICA: Back port and refine validation of the XSDT root table.
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It triggers a regression that a pointer is still used after unmapping.
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This patch fixes this issue. Lv Zheng.
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Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=73911
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Buglink: https://bugs.archlinux.org/task/39811
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Signed-off-by: Lv Zheng <lv.zheng@intel.com>
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Reported-and-tested-by: Bruce Chiarelli <mano155@gmail.com>
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Reported-and-tested-by: Spyros Stathopoulos <spystath@gmail.com>
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Cc: <stable@vger.kernel.org> # 3.14.x: 671cc68: ACPICA: Back port and refine validation of the XSDT root table.
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---
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drivers/acpi/acpica/tbutils.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
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index 6412d3c..7285871 100644
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--- a/drivers/acpi/acpica/tbutils.c
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+++ b/drivers/acpi/acpica/tbutils.c
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@@ -461,6 +461,7 @@ acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
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u32 table_count;
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struct acpi_table_header *table;
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acpi_physical_address address;
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+ acpi_physical_address rsdt_address;
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u32 length;
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u8 *table_entry;
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acpi_status status;
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@@ -488,11 +489,13 @@ acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
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* as per the ACPI specification.
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*/
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address = (acpi_physical_address) rsdp->xsdt_physical_address;
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+ rsdt_address = (acpi_physical_address) rsdp->rsdt_physical_address;
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table_entry_size = ACPI_XSDT_ENTRY_SIZE;
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} else {
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/* Root table is an RSDT (32-bit physical addresses) */
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address = (acpi_physical_address) rsdp->rsdt_physical_address;
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+ rsdt_address = address;
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table_entry_size = ACPI_RSDT_ENTRY_SIZE;
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}
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@@ -515,8 +518,7 @@ acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
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/* Fall back to the RSDT */
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- address =
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- (acpi_physical_address) rsdp->rsdt_physical_address;
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+ address = rsdt_address;
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table_entry_size = ACPI_RSDT_ENTRY_SIZE;
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}
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}
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--
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1.7.10
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