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-rw-r--r--sys/netinet6/ip6_output.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/netinet6/ip6_output.c b/sys/netinet6/ip6_output.c
index 09eab20..7af04b0 100644
--- a/sys/netinet6/ip6_output.c
+++ b/sys/netinet6/ip6_output.c
@@ -219,6 +219,8 @@ ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto,
int error;
int tlen = m0->m_pkthdr.len;
+ KASSERT(( mtu % 8 == 0), ("Fragment length must be a multiple of 8"));
+
m = m0;
ip6 = mtod(m, struct ip6_hdr *);
mnext = &m->m_nextpkt;
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