(ITS#8346) lmdb memory leak with MDB_VL32

[jeremiah . morrill]

Full_Name: Jeremiah Morrill
Version: lmdb 0.9.70
OS: Windows
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (24.120.130.199)


With MDB_VL32, I believe lmdb is leaking memory in env->txn0->mt_rpages.

Here is quick diff of what may fix this issue.  Not sure if I have redundant
null checks.

diff --git a/src/libraries/lmdb/mdb.c b/src/libraries/lmdb/mdb.cAiAindex
11832ab..1f00a66 100644
--- a/src/libraries/lmdb/mdb.c
+++ b/src/libraries/lmdb/mdb.c
@@ -5255,14 +5255,20 @@ mdb_env_close0(MDB_env *env, int excl)
        free(env->me_dbflags);
        free(env->me_path);
        free(env->me_dirty_list);
-       free(env->me_txn0);
 #ifdef MDB_VL32
+    if(env->me_txn0){
+        if(env->me_txn0->mt_rpages) {
+            free(env->me_txn0->mt_rpages);
+        }
+    }
        { unsigned int x;
                for (x=1; x<=env->me_rpages[0].mid; x++)
                munmap(env->me_rpages[x].mptr, env->me_rpages%5%5].mcnt * 
env->me_psize);
        }
        free(env->me_rpages);
 #endif
+    free(env->me_txn0);
+
        mdb_midl_free(env->me_free_pgs);
 
        if (env->me_flags & MDB_ENV_TXKEY) {