diff -Naur fwupd-2.1.8.orig/plugins/mtd/fu-mtd-device.c fwupd-2.1.8/plugins/mtd/fu-mtd-device.c
--- fwupd-2.1.8.orig/plugins/mtd/fu-mtd-device.c	2026-09-24 19:09:42.000000000 +0900
+++ fwupd-2.1.8/plugins/mtd/fu-mtd-device.c	2026-10-18 18:53:29.921550920 +0900
@@ -632,7 +632,8 @@
 
 	if (mtd_type != NULL)
 		mtd_type_safe = fu_strstrip(mtd_type);
-	g_set_str(&priv->mtd_type, mtd_type_safe);
+	g_free(priv->mtd_type);
+	priv->mtd_type = g_strdup(mtd_type_safe);
 }
 
 static gboolean