diff --git a/print-mobility.c b/print-mobility.c
index 1490b72..535f04b 100644
--- a/print-mobility.c
+++ b/print-mobility.c
@@ -74,6 +74,18 @@ struct ip6_mobility {
 #define IP6M_BINDING_UPDATE	5	/* Binding Update */
 #define IP6M_BINDING_ACK	6	/* Binding Acknowledgement */
 #define IP6M_BINDING_ERROR	7	/* Binding Error */
+#define IP6M_MAX		7
+
+static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = {
+	IP6M_MINLEN,      /* IP6M_BINDING_REQUEST  */
+	IP6M_MINLEN + 8,  /* IP6M_HOME_TEST_INIT   */
+	IP6M_MINLEN + 8,  /* IP6M_CAREOF_TEST_INIT */
+	IP6M_MINLEN + 16, /* IP6M_HOME_TEST        */
+	IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST      */
+	IP6M_MINLEN + 4,  /* IP6M_BINDING_UPDATE   */
+	IP6M_MINLEN + 4,  /* IP6M_BINDING_ACK      */
+	IP6M_MINLEN + 16, /* IP6M_BINDING_ERROR    */
+};
 
 /* Mobility Header Options */
 #define IP6MOPT_MINLEN		2
@@ -95,16 +107,20 @@ mobility_opt_print(const u_char *bp, int len)
 	int optlen;
 
 	for (i = 0; i < len; i += optlen) {
+		TCHECK(bp[i]);
 		if (bp[i] == IP6MOPT_PAD1)
 			optlen = 1;
 		else {
-			if (i + 1 < len)
+			if (i + 1 < len) {
+				TCHECK(bp[i + 1]);
 				optlen = bp[i + 1] + 2;
+			}
 			else
 				goto trunc;
 		}
 		if (i + optlen > len)
 			goto trunc;
+		TCHECK(bp[i + optlen]);
 
 		switch (bp[i]) {
 		case IP6MOPT_PAD1:
@@ -201,6 +217,10 @@ mobility_print(const u_char *bp, const u_char *bp2 _U_)
 
 	TCHECK(mh->ip6m_type);
 	type = mh->ip6m_type;
+	if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) {
+                printf("(header length %u is too small for type %u)", mhlen, type);
+		goto trunc;
+	}
 	switch (type) {
 	case IP6M_BINDING_REQUEST:
 		printf("mobility: BRR");