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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Bob Moore <robert.moore@intel.com>, Lv Zheng <lv.zheng@intel.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 042/293] ACPICA: Disassembler: Abort on an
 invalid/unknown AML opcode
Thread-Topic: [PATCH AUTOSEL for 4.9 042/293] ACPICA: Disassembler: Abort on
 an invalid/unknown AML opcode
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Date:   Mon, 9 Apr 2018 00:23:22 +0000
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From: Bob Moore <robert.moore@intel.com>

[ Upstream commit 6f0527b77d9e0129dd8e50945b0d610ed943d6b2 ]

ACPICA commit ed0389cb11a61e63c568ac1f67948fc6a7bd1aeb

An invalid opcode indicates something seriously wrong with the
input AML file. The AML parser is immediately confused and lost,
causing the resulting parse tree to be ill-formed. The actual
disassembly can then cause numerous unrelated errors and faults.

This change aborts the disassembly upon discovery of such an
opcode during the AML parse phase.

Link: https://github.com/acpica/acpica/commit/ed0389cb
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/acpi/acpica/psobject.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/acpi/acpica/psobject.c b/drivers/acpi/acpica/psobject.=
c
index db0e90342e82..ac2e8dfdf74e 100644
--- a/drivers/acpi/acpica/psobject.c
+++ b/drivers/acpi/acpica/psobject.c
@@ -121,6 +121,9 @@ static acpi_status acpi_ps_get_aml_opcode(struct acpi_w=
alk_state *walk_state)
 			     (u32)(aml_offset +
 				   sizeof(struct acpi_table_header)));
=20
+			ACPI_ERROR((AE_INFO,
+				    "Aborting disassembly, AML byte code is corrupt"));
+
 			/* Dump the context surrounding the invalid opcode */
=20
 			acpi_ut_dump_buffer(((u8 *)walk_state->parser_state.
@@ -129,6 +132,14 @@ static acpi_status acpi_ps_get_aml_opcode(struct acpi_=
walk_state *walk_state)
 					     sizeof(struct acpi_table_header) -
 					     16));
 			acpi_os_printf(" */\n");
+
+			/*
+			 * Just abort the disassembly, cannot continue because the
+			 * parser is essentially lost. The disassembler can then
+			 * randomly fail because an ill-constructed parse tree
+			 * can result.
+			 */
+			return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 #endif
 		}
=20
@@ -293,6 +304,9 @@ acpi_ps_create_op(struct acpi_walk_state *walk_state,
 	if (status =3D=3D AE_CTRL_PARSE_CONTINUE) {
 		return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
 	}
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
=20
 	/* Create Op structure and append to parent's argument list */
=20
--=20
2.15.1