mdbx: fix SIGSEGV/invalid-deref/invalid-free inside `env_close()` when `mdbx_env_open()` failed in re-open case.

Thanks to [@leisim](https://t.me/leisim) for [reporting](https://t.me/libmdbx/3946) this issue.
2022-11-23 00:57:02 +03:00 · 2022-11-23 00:57:02 +03:00 · a1333fc827
parent da023657f5
commit a1333fc827
1 changed files with 2 additions and 1 deletions
--- a/src/core.c
+++ b/src/core.c
@ -14280,9 +14280,10 @@ __cold static int env_close(MDBX_env *env) {
  }

  if (env->me_dbxs) {
-    for (size_t i = env->me_numdbs; --i >= CORE_DBS;)
+    for (size_t i = CORE_DBS; i < env->me_numdbs; ++i)
      osal_free(env->me_dbxs[i].md_name.iov_base);
    osal_free(env->me_dbxs);
+    env->me_numdbs = CORE_DBS;
    env->me_dbxs = nullptr;
  }
  if (env->me_pbuf) {