--- a/fileio.c	2014-12-05 05:06:05 -0600

+++ b/fileio.c	2017-11-14 01:06:28 -0600

@@ -1,5 +1,5 @@

 /*

-  Copyright (c) 1990-2009 Info-ZIP.  All rights reserved.

+  Copyright (c) 1990-2017 Info-ZIP.  All rights reserved.

   See the accompanying file LICENSE, version 2009-Jan-02 or later

   (the contents of which are also included in unzip.h) for terms of use.

@@ -1582,6 +1582,8 @@

     int r = IZ_PW_ENTERED;

     char *m;

     char *prompt;

+    char *ep;

+    char *zp;

 #ifndef REENTRANT

     /* tell picky compilers to shut up about "unused variable" warnings */

@@ -1590,9 +1592,12 @@

     if (*rcnt == 0) {           /* First call for current entry */

         *rcnt = 2;

-        if ((prompt = (char *)malloc(2*FILNAMSIZ + 15)) != (char *)NULL) {

-            sprintf(prompt, LoadFarString(PasswPrompt),

-                    FnFilter1(zfn), FnFilter2(efn));

+        zp = FnFilter1( zfn);

+        ep = FnFilter2( efn);

+        prompt = (char *)malloc(        /* Slightly too long (2* "%s"). */

+         sizeof( PasswPrompt)+ strlen( zp)+ strlen( ep));

+        if (prompt != (char *)NULL) {

+            sprintf(prompt, LoadFarString(PasswPrompt), zp, ep);

             m = prompt;

         } else

             m = (char *)LoadFarString(PasswPrompt2);