1 Fix for CVE-2016-10195

     2 

     3 More details at:

     4 

     5   https://github.com/libevent/libevent/issues/317

     6 

     7 Based on commit at:

     8 

     9   https://github.com/libevent/libevent/commit/96f64a022014a208105ead6c8a7066018449d86d

    10 

    11 --- libevent-2.0.22/evdns.c.orig	2017-02-02 07:18:16.307620386 +0000

    12 +++ libevent-2.0.22/evdns.c	2017-02-02 07:23:36.432656559 +0000

    13 @@ -960,7 +960,6 @@

    14  

    15  	for (;;) {

    16  		u8 label_len;

    17 -		if (j >= length) return -1;

    18  		GET8(label_len);

    19  		if (!label_len) break;

    20  		if (label_len & 0xc0) {

    21 @@ -980,7 +979,7 @@

    22  			if (cp + 1 >= end) return -1;

    23  			*cp++ = '.';

    24  		}

    25 -		if (cp + label_len >= end) return -1;

    26 +		if (j + label_len > length) return -1;

    27  		memcpy(cp, packet + j, label_len);

    28  		cp += label_len;

    29  		j += label_len;