https://bugzilla.kernel.org/show_bug.cgi?id=206343
--- Comment #1 from Steven Clarkson (s...@lambdal.com) ---
Turns out this causes the kernel to hang in the while loop parsing the SRAT
table in count_immovable_mem_regions. After dumping the SRAT table, it looks
like there's 320 bytes of zeros in the middle of it.
Sure enough, dmesg complains
[ 0.007413] ACPI: [SRAT:0x00] Invalid zero length
[ 0.007415] ACPI: [SRAT:0x01] Invalid zero length
Proposed patch below.
diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index 25019d42ae93..7369de333eda 100644
--- a/arch/x86/boot/compressed/acpi.c
+++ b/arch/x86/boot/compressed/acpi.c
@@ -394,6 +394,12 @@ int count_immovable_mem_regions(void)
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");
+ break;
+ }
+
if (sub_table->type == ACPI_SRAT_TYPE_MEMORY_AFFINITY) {
struct acpi_srat_mem_affinity *ma;
--
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