diff mbox series

ACPI: FPDT: break out of the loop if record length is zero

Message ID 20230925214046.1051350-1-anarsoul@gmail.com
State New
Headers show
Series ACPI: FPDT: break out of the loop if record length is zero | expand

Commit Message

Vasily Khoruzhick Sept. 25, 2023, 9:40 p.m. UTC 
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@vger.kernel.org

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
---
 drivers/acpi/acpi_fpdt.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

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) {