From 73f45e5e96ccc13a131f7c0122cf8600ce5b930f Mon Sep 17 00:00:00 2001
From: "NARUSE, Yui" <naruse@airemix.jp>
Date: Tue, 12 Apr 2022 19:53:43 +0900
Subject: [PATCH] Just free compiled pattern if no space is used

---
 regcomp.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/regcomp.c b/regcomp.c
index d51163103e..fbef92e18f 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -142,8 +142,13 @@ bitset_on_num(BitSetRef bs)
 static void
 onig_reg_resize(regex_t *reg)
 {
-  resize:
-    if (reg->alloc > reg->used) {
+  do {
+    if (!reg->used) {
+      xfree(reg->p);
+      reg->alloc = 0;
+      reg->p = 0;
+    }
+    else if (reg->alloc > reg->used) {
       unsigned char *new_ptr = xrealloc(reg->p, reg->used);
       // Skip the right size optimization if memory allocation fails
       if (new_ptr) {
@@ -151,10 +156,7 @@ onig_reg_resize(regex_t *reg)
         reg->p = new_ptr;
       }
     }
-    if (reg->chain) {
-      reg = reg->chain;
-      goto resize;
-    }
+  } while ((reg = reg->chain) != 0);
 }
 
 extern int