This patch corrects a bug in tcpdump which prevents it from reporting
any packets at all in some circumstances.

Rick Sladkey <jrs@world.std.com>

*** libpcap-0.0/pcap-linux.c.orig	Tue Apr 25 01:02:11 1995
--- libpcap-0.0/pcap-linux.c	Tue Apr 25 00:42:26 1995
***************
*** 71,76 ****
--- 71,77 ----
    }
  
    do {
+     from_len = sizeof(from);
      datalen = recvfrom(p->fd,buf,bufsize,0,&from,&from_len);
  
      if (datalen < 0) {