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diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -534,10 +534,10 @@
return;
}
#endif
- if (m->m_len < ETHER_HDR_LEN) {
- /* XXX maybe should pullup? */
+ if (__predict_false(m->m_len < ETHER_HDR_LEN)) {
+ /* Drivers should pullup and ensure the mbuf is valid */
if_printf(ifp, "discard frame w/o leading ethernet "
- "header (len %u pkt len %u)\n",
+ "header (len %d pkt len %d)\n",
m->m_len, m->m_pkthdr.len);
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
m_freem(m);

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