From https://bugzilla.redhat.com/show_bug.cgi?id=1165162

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

--- tcpdump-tcpdump-4.6/print-udp.c	2014-11-21 13:53:05.757690197 +0700
+++ tcpdump-4.6.2/print-udp.c	2014-11-21 13:50:58.077695164 +0700
@@ -357,6 +357,12 @@
 #ifdef INET6
 	register const struct ip6_hdr *ip6;
 #endif
+	u_int caplength;
+
+	/* Checking length of available data before print */
+	caplength = (ndo->ndo_snapend >= bp) ? ndo->ndo_snapend - bp : 0;
+	if (length > caplength)
+		length = caplength;
 
 	if (ep > ndo->ndo_snapend)
 		ep = ndo->ndo_snapend;