efi_loader: set CapsuleLast after each capsule

If multiple capsules are applied, the FMP drivers for the individual
capsules can expect the value of CapsuleLast to be accurate. Hence
CapsuleLast must be updated after each capsule.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

lib/efi_loader/efi_capsule.c

@@ -102,8 +102,20 @@ void set_capsule_result(int index, struct efi_capsule_header *capsule,
 				   EFI_VARIABLE_BOOTSERVICE_ACCESS |
 				   EFI_VARIABLE_RUNTIME_ACCESS,
 				   sizeof(result), &result, false);
-	if (ret)
+	if (ret != EFI_SUCCESS) {
 		log_err("Setting %ls failed\n", variable_name16);
+		return;
+	}
+
+	/* Variable CapsuleLast must not include terminating 0x0000 */
+	ret = efi_set_variable_int(L"CapsuleLast", &efi_guid_capsule_report,
+				   EFI_VARIABLE_READ_ONLY |
+				   EFI_VARIABLE_NON_VOLATILE |
+				   EFI_VARIABLE_BOOTSERVICE_ACCESS |
+				   EFI_VARIABLE_RUNTIME_ACCESS,
+				   22, variable_name16, false);
+	if (ret != EFI_SUCCESS)
+		log_err("Setting %ls failed\n", L"CapsuleLast");
 }
 
 #ifdef CONFIG_EFI_CAPSULE_FIRMWARE_MANAGEMENT
@@ -990,7 +1002,6 @@ efi_status_t efi_launch_capsules(void)
 	struct efi_capsule_header *capsule = NULL;
 	u16 **files;
 	unsigned int nfiles, index, i;
-	u16 variable_name16[12];
 	efi_status_t ret;
 
 	if (!check_run_capsules())
@@ -1042,16 +1053,6 @@ efi_status_t efi_launch_capsules(void)
 		free(files[i]);
 	free(files);
 
-	/* CapsuleLast */
-	efi_create_indexed_name(variable_name16, sizeof(variable_name16),
-				"Capsule", index - 1);
-	efi_set_variable_int(L"CapsuleLast", &efi_guid_capsule_report,
-			     EFI_VARIABLE_READ_ONLY |
-			     EFI_VARIABLE_NON_VOLATILE |
-			     EFI_VARIABLE_BOOTSERVICE_ACCESS |
-			     EFI_VARIABLE_RUNTIME_ACCESS,
-			     22, variable_name16, false);
-
 	return ret;
 }
 #endif /* CONFIG_EFI_CAPSULE_ON_DISK */