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-rw-r--r--drivers/acpi/acpica/utresrc.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utresrc.c b/drivers/acpi/acpica/utresrc.c
index ff096d9755b9..e0587c85bafd 100644
--- a/drivers/acpi/acpica/utresrc.c
+++ b/drivers/acpi/acpica/utresrc.c
@@ -474,6 +474,15 @@ acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state,
return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}
+ /*
+ * The end_tag opcode must be followed by a zero byte.
+ * Although this byte is technically defined to be a checksum,
+ * in practice, all ASL compilers set this byte to zero.
+ */
+ if (*(aml + 1) != 0) {
+ return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
+ }
+
/* Return the pointer to the end_tag if requested */
if (!user_function) {