Change db_tdb_fetch_locked to use only one talloc

(This used to be commit 921c8657e2eeb71d5b9ae2675255a852b26cc30d)

1 files changed, 53 insertions, 35 deletions

diff --git a/source3/lib/dbwrap_tdb.c b/source3/lib/dbwrap_tdb.c
index b24fd0618a..cce987d789 100644
--- a/source3/lib/dbwrap_tdb.c
+++ b/source3/lib/dbwrap_tdb.c
@@ -43,33 +43,50 @@ static int db_tdb_record_destr(struct db_record* data)
 	return 0;
 }
 
-static struct db_record *db_tdb_fetch_locked(struct db_context *db,
-				     TALLOC_CTX *mem_ctx, TDB_DATA key)
-{
-	struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
-						       struct db_tdb_ctx);
+struct tdb_fetch_locked_state {
+	TALLOC_CTX *mem_ctx;
 	struct db_record *result;
-	TDB_DATA value;
+};
 
-	result = TALLOC_P(mem_ctx, struct db_record);
-	if (result == NULL) {
-		DEBUG(0, ("talloc failed\n"));
-		return NULL;
+static int db_tdb_fetchlock_parse(TDB_DATA key, TDB_DATA data,
+				  void *private_data)
+{
+	struct tdb_fetch_locked_state *state =
+		(struct tdb_fetch_locked_state *)private_data;
+
+	state->result = (struct db_record *)talloc_size(
+		state->mem_ctx,
+		sizeof(struct db_record) + key.dsize + data.dsize);
+
+	if (state->result == NULL) {
+		return 0;
 	}
 
-	result->key.dsize = key.dsize;
-	result->key.dptr = (uint8 *)talloc_memdup(result, key.dptr, key.dsize);
-	if (result->key.dptr == NULL) {
-		DEBUG(0, ("talloc failed\n"));
-		TALLOC_FREE(result);
-		return NULL;
+	state->result->key.dsize = key.dsize;
+	state->result->key.dptr = ((uint8 *)state->result)
+		+ sizeof(struct db_record);
+	memcpy(state->result->key.dptr, key.dptr, key.dsize);
+
+	state->result->value.dsize = data.dsize;
+
+	if (data.dsize > 0) {
+		state->result->value.dptr = state->result->key.dptr + key.dsize;
+		memcpy(state->result->value.dptr, data.dptr, data.dsize);
 	}
+	else {
+		state->result->value.dptr = NULL;
+	}
+
+	return 0;
+}
 
-	result->value.dptr = NULL;
-	result->value.dsize = 0;
-	result->private_data = talloc_reference(result, ctx);
-	result->store = db_tdb_store;
-	result->delete_rec = db_tdb_delete;
+static struct db_record *db_tdb_fetch_locked(struct db_context *db,
+				     TALLOC_CTX *mem_ctx, TDB_DATA key)
+{
+	struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
+						       struct db_tdb_ctx);
+	struct tdb_fetch_locked_state state;
+	int res;
 
 	if (DEBUGLEVEL >= 10) {
 		char *keystr = hex_encode(NULL, key.dptr, key.dsize);
@@ -81,32 +98,33 @@ static struct db_record *db_tdb_fetch_locked(struct db_context *db,
 
 	if (tdb_chainlock(ctx->wtdb->tdb, key) != 0) {
 		DEBUG(3, ("tdb_chainlock failed\n"));
-		TALLOC_FREE(result);
 		return NULL;
 	}
 
-	talloc_set_destructor(result, db_tdb_record_destr);
+	state.mem_ctx = mem_ctx;
+	state.result = NULL;
 
-	value = tdb_fetch(ctx->wtdb->tdb, key);
+	res = tdb_parse_record(ctx->wtdb->tdb, key, db_tdb_fetchlock_parse,
+			       &state);
 
-	if (value.dptr == NULL) {
-		return result;
+	if (state.result == NULL) {
+		db_tdb_fetchlock_parse(key, tdb_null, &state);
 	}
 
-	result->value.dsize = value.dsize;
-	result->value.dptr = (uint8 *)talloc_memdup(result, value.dptr,
-						    value.dsize);
-	if (result->value.dptr == NULL) {
-		DEBUG(3, ("talloc failed\n"));
-		TALLOC_FREE(result);
+	if (state.result == NULL) {
+		tdb_chainunlock(ctx->wtdb->tdb, key);
 		return NULL;
 	}
 
-	SAFE_FREE(value.dptr);
+	talloc_set_destructor(state.result, db_tdb_record_destr);
 
-	DEBUG(10, ("Allocated locked data 0x%p\n", result));
+	state.result->private_data = talloc_reference(state.result, ctx);
+	state.result->store = db_tdb_store;
+	state.result->delete_rec = db_tdb_delete;
 
-	return result;
+	DEBUG(10, ("Allocated locked data 0x%p\n", state.result));
+
+	return state.result;
 }
 
 static int db_tdb_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,