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authorErik Schmauss <erik.schmauss@intel.com>2018-10-18 00:20:51 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-10-18 10:17:04 +0300
commitc64baa3a6fa207d112706bc5e7fd645cd8a8663f (patch)
tree3af11ad5e7c2a6fec7a8043ec8ed4bbe540ee3a9 /drivers/acpi/acpica
parent4abb951b73ff0a8a979113ef185651aa3c8da19b (diff)
downloadlinux-c64baa3a6fa207d112706bc5e7fd645cd8a8663f.tar.xz
ACPICA: AML Parser: fix parse loop to correctly skip erroneous extended opcodes
AML opcodes come in two lengths: 1-byte opcodes and 2-byte, extended opcodes. If an error occurs due to illegal opcodes during table load, the AML parser needs to continue loading the table. In order to do this, it needs to skip parsing of the offending opcode and operands associated with that opcode. This change fixes the AML parse loop to correctly skip parsing of incorrect extended opcodes. Previously, only the short opcodes were skipped correctly. Signed-off-by: Erik Schmauss <erik.schmauss@intel.com> Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica')
-rw-r--r--drivers/acpi/acpica/psloop.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/acpi/acpica/psloop.c b/drivers/acpi/acpica/psloop.c
index 34fc2f7476ed..b0789c483b0f 100644
--- a/drivers/acpi/acpica/psloop.c
+++ b/drivers/acpi/acpica/psloop.c
@@ -417,6 +417,7 @@ acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
union acpi_parse_object *op = NULL; /* current op */
struct acpi_parse_state *parser_state;
u8 *aml_op_start = NULL;
+ u8 opcode_length;
ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
@@ -540,8 +541,19 @@ acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
"Skip parsing opcode %s",
acpi_ps_get_opcode_name
(walk_state->opcode)));
+
+ /*
+ * Determine the opcode length before skipping the opcode.
+ * An opcode can be 1 byte or 2 bytes in length.
+ */
+ opcode_length = 1;
+ if ((walk_state->opcode & 0xFF00) ==
+ AML_EXTENDED_OPCODE) {
+ opcode_length = 2;
+ }
walk_state->parser_state.aml =
- walk_state->aml + 1;
+ walk_state->aml + opcode_length;
+
walk_state->parser_state.aml =
acpi_ps_get_next_package_end
(&walk_state->parser_state);