Index: sys/sys/mbuf.h
===================================================================
--- sys/sys/mbuf.h
+++ sys/sys/mbuf.h
@@ -757,7 +757,10 @@
 m_clrprotoflags(struct mbuf *m)
 {
 
-	m->m_flags &= ~M_PROTOFLAGS;
+	while (m) {
+		m->m_flags &= ~M_PROTOFLAGS;
+		m = m->m_next;
+	}
 }
 
 static __inline struct mbuf *