Check that we have the expected room before m_data

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/udp6.c b/src/udp6.c
index fdd8089..97156d1 100644
--- a/src/udp6.c
+++ b/src/udp6.c
@@ -153,6 +153,8 @@ bad:
 int udp6_output(struct socket *so, struct mbuf *m, struct sockaddr_in6 *saddr,
                 struct sockaddr_in6 *daddr)
 {
+    g_assert(M_ROOMBEFORE(m) >= sizeof(struct ip6) + sizeof(struct udphdr));
+
     struct ip6 *ip;
     struct udphdr *uh;