Buggy BIOSes may have zero-length records in FPDT, table, as a result
fpdt_process_subtable() spins in eternal loop.
Break out of the loop if record length is zero.
Fixes: d1eb86e59be0 ("ACPI: tables: introduce support for FPDT table")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Vasily Khoruzhick <anarsoul@xxxxxxxxx>
---
drivers/acpi/acpi_fpdt.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/acpi/acpi_fpdt.c b/drivers/acpi/acpi_fpdt.c
index a2056c4c8cb7..53d8f9601a55 100644
--- a/drivers/acpi/acpi_fpdt.c
+++ b/drivers/acpi/acpi_fpdt.c
@@ -194,6 +194,11 @@ static int fpdt_process_subtable(u64 address, u32 subtable_type)
record_header = (void *)subtable_header + offset;
offset += record_header->length;
+ if (!record_header->length) {
+ pr_info(FW_BUG "Zero-length record found.\n");
+ break;
+ }
+
switch (record_header->type) {
case RECORD_S3_RESUME:
if (subtable_type != SUBTABLE_S3PT) {
--
2.42.0
