grok-re-buf-overflow-fix.diff

--- grokre.c.orig	2018-12-26 17:04:07.000000000 +0200
+++ grokre.c	2018-12-26 17:04:43.000000000 +0200
@@ -173,8 +173,8 @@
   capture_vector = calloc(3 * g_pattern_num_captures, sizeof(int));
   full_len = grok->pattern_len;
   full_size = full_len;
-  full_pattern = calloc(1, full_size);
-  memcpy(full_pattern, grok->pattern, full_len);
+  full_pattern = calloc(1, full_size + 1);
+  memcpy(full_pattern, grok->pattern, full_len + 1);
   grok_log(grok, LOG_REGEXPAND, "% 20s: %.*s", "start of expand",
            full_len, full_pattern);