Patch based on http://seclists.org/oss-sec/2016/q4/600

The community plans to fix this security vulnerability in a future

release, so we will not pass this patch to the community.

--- unzip60/zipinfo.c	2017-01-12 01:09:21.487547363 -0800

+++ unzip60/zipinfo.c.new	2017-01-12 01:13:38.476562067 -0800

@@ -1987,7 +1987,18 @@

         ush  dnum=(ush)((G.crec.general_purpose_bit_flag>>1) & 3);

         methbuf[3] = dtype[dnum];

     } else if (methnum >= NUM_METHODS) {   /* unknown */

-        sprintf(&methbuf[1], "%03u", G.crec.compression_method);

+        /* 2016-12-05 SMS. 

+         * https://launchpad.net/bugs/1643750 

+         * Unexpectedly large compression methods overflow 

+         * &methbuf[].  Use the old, three-digit decimal format 

+         * for values which fit.  Otherwise, sacrifice the "u", 

+         * and use four-digit hexadecimal. 

+         */

+         if (G.crec.compression_method <= 999) {

+            sprintf(&methbuf[1], "%03u", G.crec.compression_method);

+         } else {

+            sprintf(&methbuf[0], "%04X", G.crec.compression_method);

+         }

     }

     for (k = 0;  k < 15;  ++k)