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-rw-r--r--arch/x86/boot/compressed/acpi.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index 25019d42ae93..ef2ad7253cd5 100644
--- a/arch/x86/boot/compressed/acpi.c
+++ b/arch/x86/boot/compressed/acpi.c
@@ -393,7 +393,13 @@ int count_immovable_mem_regions(void)
table = table_addr + sizeof(struct acpi_table_srat);
while (table + sizeof(struct acpi_subtable_header) < table_end) {
+
sub_table = (struct acpi_subtable_header *)table;
+ if (!sub_table->length) {
+ debug_putstr("Invalid zero length SRAT subtable.\n");
+ return 0;
+ }
+
if (sub_table->type == ACPI_SRAT_TYPE_MEMORY_AFFINITY) {
struct acpi_srat_mem_affinity *ma;