From https://bugzilla.redhat.com/show_bug.cgi?id=1165161

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

--- tcpdump-tcpdump_4.5/print-geonet.c	2014-02-17 05:58:41.000000000 +0700
+++ print-geonet.c	2014-11-21 10:06:58.590217933 +0700
@@ -237,6 +237,12 @@
 		printf("Malformed (small) ");
 	}
 
+	/* Checking length before print */
+	u_int caplength;
+	caplength = (ndo->ndo_snapend >= bp) ? ndo->ndo_snapend - bp : 0;
+	if (length > caplength)
+		length = caplength;
+
 	/* Print user data part */
 	if (ndo->ndo_vflag)
 		default_print(bp, length);