ACPI / tables: Check if id is NULL in acpi_table_parse()
strncmp() does not check if the params are NULL. In acpi_table_parse(),
if @id is NULL, the kernel will panic.
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 4ec4425..a17619b 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -293,7 +293,7 @@
if (acpi_disabled)
return -ENODEV;
- if (!handler)
+ if (!id || !handler)
return -EINVAL;
if (strncmp(id, ACPI_SIG_MADT, 4) == 0)