diff -Naur psmisc-22.6/src/pstree.c psmisc-22.6.tpg/src/pstree.c
--- psmisc-22.6/src/pstree.c	2006-01-23 04:26:21.000000000 +0000
+++ psmisc-22.6.tpg/src/pstree.c	2008-05-07 18:20:49.000000000 +0000
@@ -608,6 +608,7 @@
 		perror (path);
 		exit (1);
 	      }
+	    memset(readbuf, '\0', BUFSIZ + 1);
             fread(readbuf, BUFSIZ, 1, file) ;
             if (ferror(file) == 0) 
             {