ITS#7377 Catch MDB user errors.

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index 8aacb88ad99df498a8d77f77598d2a926a7187af..533ec7b4a8687b4306b8546368ecd2376fe63a47 100644 (file)
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -1698,7 +1698,7 @@ mdb_txn_renew(MDB_txn *txn)
 {
        int rc;
 
-       if (!txn)
+       if (! (txn && txn->mt_flags & MDB_TXN_RDONLY))
                return EINVAL;
 
        if (txn->mt_env->me_flags & MDB_FATAL_ERROR) {
@@ -1728,13 +1728,13 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
        if ((env->me_flags & MDB_RDONLY) && !(flags & MDB_RDONLY))
                return EACCES;
        if (parent) {
-               /* parent already has an active child txn */
-               if (parent->mt_child) {
+               /* Nested transactions: Max 1 child, write txns only, no writemap */
+               if (parent->mt_child ||
+                       (flags & MDB_RDONLY) || (parent->mt_flags & MDB_TXN_RDONLY) ||
+                       (env->me_flags & MDB_WRITEMAP))
+               {
                        return EINVAL;
                }
-               /* nested TXNs not supported here */
-               if (env->me_flags & MDB_WRITEMAP)
-                       return EINVAL;
        }
        size = sizeof(MDB_txn) + env->me_maxdbs * (sizeof(MDB_db)+1);
        if (!(flags & MDB_RDONLY))
@@ -3102,6 +3102,9 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode)
        int             oflags, rc, len, excl;
        char *lpath, *dpath;
 
+       if (env->me_fd != INVALID_HANDLE_VALUE)
+               return EINVAL;
+
        len = strlen(path);
        if (flags & MDB_NOSUBDIR) {
                rc = len + sizeof(LOCKSUFF) + len + 1;