From 68acb60984c7d61368fbd87772cd8b8e73c0f298 Mon Sep 17 00:00:00 2001
From: Penner <penneryu@gmail.com>
Date: Tue, 6 May 2025 18:48:14 +0800
Subject: [PATCH] fixed realloc(0) may alloc min unit memory on some allocator

---
 libregexp.c | 2 +-
 libregexp.h | 1 +
 quickjs.c   | 7 +++++++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/libregexp.c b/libregexp.c
index 8c47389..e94e652 100644
--- a/libregexp.c
+++ b/libregexp.c
@@ -2448,7 +2448,7 @@ int lre_exec(uint8_t **capture,
     stack_buf = alloca(alloca_size);
     ret = lre_exec_backtrack(s, capture, stack_buf, 0, bc_buf + RE_HEADER_LEN,
                              cbuf + (cindex << cbuf_type), FALSE);
-    lre_realloc(s->opaque, s->state_stack, 0);
+    lre_free(s->opaque, s->state_stack);
     return ret;
 }
 
diff --git a/libregexp.h b/libregexp.h
index 7475bbe..e0b9bd8 100644
--- a/libregexp.h
+++ b/libregexp.h
@@ -56,5 +56,6 @@ int lre_check_stack_overflow(void *opaque, size_t alloca_size);
 /* must be provided by the user, return non zero if time out */
 int lre_check_timeout(void *opaque);
 void *lre_realloc(void *opaque, void *ptr, size_t size);
+void lre_free(void *opaque, void *ptr);
 
 #endif /* LIBREGEXP_H */
diff --git a/quickjs.c b/quickjs.c
index 6119975..2401c71 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -44594,6 +44594,13 @@ void *lre_realloc(void *opaque, void *ptr, size_t size)
     return js_realloc_rt(ctx->rt, ptr, size);
 }
 
+void lre_free(void *opaque, void *ptr)
+{
+    JSContext *ctx = opaque;
+    /* No JS exception is raised here */
+    js_free_rt(ctx->rt, ptr);
+}
+
 static JSValue js_regexp_escape(JSContext *ctx, JSValueConst this_val,
                                 int argc, JSValueConst *argv)
 {