r16825: Make ldb_sainity_check() set an error string. This makes it much

easier to chase down what modules or application code gets wrong.

Ensure not to leave memory allocated on failure in ldb_search()

Andrew Bartlett
(This used to be commit 0828739951ed879640f8ed6e4700d8ca6b8221b8)

4 files changed, 26 insertions, 13 deletions

diff --git a/source4/lib/ldb/common/ldb.c b/source4/lib/ldb/common/ldb.c
index 5228eeb6b3..c059646629 100644
--- a/source4/lib/ldb/common/ldb.c
+++ b/source4/lib/ldb/common/ldb.c
@@ -527,11 +527,8 @@ int ldb_search(struct ldb_context *ldb,
 	struct ldb_request *req;
 	int ret;
 
-	*res = talloc_zero(ldb, struct ldb_result);
-	if (! *res) {
-		return LDB_ERR_OPERATIONS_ERROR;
-	}
-
+	*res = NULL;
+	
 	req = talloc(ldb, struct ldb_request);
 	if (req == NULL) {
 		ldb_set_errstring(ldb, talloc_strdup(ldb, "Out of memory!"));
@@ -549,6 +546,12 @@ int ldb_search(struct ldb_context *ldb,
 		return LDB_ERR_OPERATIONS_ERROR;
 	}
 
+	*res = talloc_zero(ldb, struct ldb_result);
+	if (! *res) {
+		talloc_free(req);
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
 	req->op.search.attrs = attrs;
 	req->controls = NULL;
 	req->async.context = res;
@@ -581,9 +584,11 @@ int ldb_add(struct ldb_context *ldb,
 	struct ldb_request *req;
 	int ret;
 
-	ret = ldb_msg_sanity_check(message);
-	if (ret != LDB_SUCCESS) return ret;
-
+	ret = ldb_msg_sanity_check(ldb, message);
+	if (ret != LDB_SUCCESS) {
+		return ret;
+	}
+		
 	req = talloc(ldb, struct ldb_request);
 	if (req == NULL) {
 		ldb_set_errstring(ldb, talloc_strdup(ldb, "Out of memory!"));
@@ -613,7 +618,7 @@ int ldb_modify(struct ldb_context *ldb,
 	struct ldb_request *req;
 	int ret;
 
-	ret = ldb_msg_sanity_check(message);
+	ret = ldb_msg_sanity_check(ldb, message);
 	if (ret != LDB_SUCCESS) return ret;
 
 	req = talloc(ldb, struct ldb_request);
diff --git a/source4/lib/ldb/common/ldb_msg.c b/source4/lib/ldb/common/ldb_msg.c
index bae17e7046..797d050975 100644
--- a/source4/lib/ldb/common/ldb_msg.c
+++ b/source4/lib/ldb/common/ldb_msg.c
@@ -550,18 +550,20 @@ struct ldb_message *ldb_msg_diff(struct ldb_context *ldb,
 	return mod;
 }
 
-int ldb_msg_sanity_check(const struct ldb_message *msg)
+int ldb_msg_sanity_check(struct ldb_context *ldb, 
+			 const struct ldb_message *msg)
 {
 	int i, j;
 
 	/* basic check on DN */
 	if (msg->dn == NULL) {
 		/* TODO: return also an error string */
+		ldb_set_errstring(ldb, talloc_strdup(ldb, "ldb message lacks a DN!"));
 		return LDB_ERR_INVALID_DN_SYNTAX;
 	}
 	if (msg->dn->comp_num == 0) {
 		/* root dse has empty dn */
-		/* TODO: return also an error string */
+		ldb_set_errstring(ldb, talloc_strdup(ldb, "DN on new ldb message is '' (not permitted)!"));
 		return LDB_ERR_ENTRY_ALREADY_EXISTS;
 	}
 
@@ -569,8 +571,13 @@ int ldb_msg_sanity_check(const struct ldb_message *msg)
 	for (i = 0; i < msg->num_elements; i++) {
 		for (j = 0; j < msg->elements[i].num_values; j++) {
 			if (msg->elements[i].values[j].length == 0) {
+				TALLOC_CTX *mem_ctx = talloc_new(ldb);
 				/* an attribute cannot be empty */
 				/* TODO: return also an error string */
+				ldb_set_errstring(ldb, talloc_asprintf(mem_ctx, "Element %s has empty attribute in ldb message (%s)!",
+								       msg->elements[i].name, 
+								       ldb_dn_linearize(mem_ctx, msg->dn)));
+				talloc_free(mem_ctx);
 				return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
 			}
 		}
diff --git a/source4/lib/ldb/include/ldb.h b/source4/lib/ldb/include/ldb.h
index b684b03ef4..2f0464b953 100644
--- a/source4/lib/ldb/include/ldb.h
+++ b/source4/lib/ldb/include/ldb.h
@@ -1207,7 +1207,8 @@ int ldb_msg_check_string_attribute(const struct ldb_message *msg,
    LDB_ERR_INVALID_ATTRIBUTE_SYNTAX) if there is a problem with a
    message.
 */
-int ldb_msg_sanity_check(const struct ldb_message *msg);
+int ldb_msg_sanity_check(struct ldb_context *ldb,
+			 const struct ldb_message *msg);
 
 /**
    Duplicate an ldb_val structure
diff --git a/source4/lib/ldb/modules/objectclass.c b/source4/lib/ldb/modules/objectclass.c
index efe93be3d4..473d5a3e6f 100644
--- a/source4/lib/ldb/modules/objectclass.c
+++ b/source4/lib/ldb/modules/objectclass.c
@@ -412,7 +412,7 @@ static int objectclass_do_mod(struct ldb_async_handle *h) {
 		}
 	}
 
-	ret = ldb_msg_sanity_check(msg);
+	ret = ldb_msg_sanity_check(ac->module->ldb, msg);
 	if (ret != LDB_SUCCESS) {
 		talloc_free(mem_ctx);
 		return ret;