Fix buffer realloc issue

Author: ohler55

CHANGELOG.md

@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## 3.16.12 - unreleased
+
+- Fixed dump realloc bug that occurred when using the compat mode dump options.
+
 ## 3.16.11 - 2025-05-29
 
 - Fixed range encoding with the :circular option

ext/oj/dump.c

@@ -1022,7 +1022,7 @@ void oj_dump_cstr(const char *str, size_t cnt, bool is_sym, bool escape1, Out ou
     char  *cmap;
 #ifdef HAVE_SIMD_NEON
     uint8x16x4_t *cmap_neon = NULL;
-    int           neon_table_size;
+    int           neon_table_size = 0;
 #endif /* HAVE_SIMD_NEON */
     const char *orig                  = str;
     bool        has_hi                = false;

ext/oj/dump_compat.c

@@ -148,10 +148,10 @@ static void dump_array(VALUE a, int depth, Out out, bool as_ok) {
         } else {
             size = d2 * out->indent + 2;
         }
-        assure_size(out, size * cnt);
         cnt--;
         for (i = 0; i <= cnt; i++) {
             if (out->opts->dump_opts.use) {
+		assure_size(out, size);
                 if (0 < out->opts->dump_opts.array_size) {
                     APPEND_CHARS(out->cur, out->opts->dump_opts.array_nl, out->opts->dump_opts.array_size);
                 }

lib/oj/version.rb

@@ -1,4 +1,4 @@
 module Oj
   # Current version of the module.
-  VERSION = '3.16.11'
+  VERSION = '3.16.12'
 end