ACPI: PRM: Skip handlers with NULL handler_address or NULL VA

If handler_address or mapped VA is NULL, the related buffer address and
VA can be ignored, so make acpi_parse_prmt() skip the current handler
in those cases.

Signed-off-by: Shang song (Lenovo) <shangsong2@foxmail.com>
Link: https://patch.msgid.link/20250826030229.834901-1-shangsong2@foxmail.com
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: Shang song (Lenovo)

drivers/acpi/prmt.c

@@ -150,15 +150,28 @@ acpi_parse_prmt(union acpi_subtable_headers *header, const unsigned long end)
 		th = &tm->handlers[cur_handler];
 
 		guid_copy(&th->guid, (guid_t *)handler_info->handler_guid);
+
+		/*
+		 * Print an error message if handler_address is NULL, the parse of VA also
+		 * can be skipped.
+		 */
+		if (unlikely(!handler_info->handler_address)) {
+			pr_info("Skipping handler with NULL address for GUID: %pUL",
+					(guid_t *)handler_info->handler_guid);
+			continue;
+		}
+
 		th->handler_addr =
 			(void *)efi_pa_va_lookup(&th->guid, handler_info->handler_address);
 		/*
-		 * Print a warning message if handler_addr is zero which is not expected to
-		 * ever happen.
+		 * Print a warning message and skip the parse of VA if handler_addr is zero
+		 * which is not expected to ever happen.
 		 */
-		if (unlikely(!th->handler_addr))
+		if (unlikely(!th->handler_addr)) {
 			pr_warn("Failed to find VA of handler for GUID: %pUL, PA: 0x%llx",
 				&th->guid, handler_info->handler_address);
+			continue;
+		}
 
 		th->static_data_buffer_addr =
 			efi_pa_va_lookup(&th->guid, handler_info->static_data_buffer_address);