Return "Invalid tdb context" instead of crashing when tdb_error called

with NULL tdb context.
(This used to be commit ba9f24c0964054f22cd8f0de32cfeacb88b4800c)

1 files changed, 6 insertions, 2 deletions

diff --git a/source3/tdb/tdb.c b/source3/tdb/tdb.c
index c469436f75..a754c583e6 100644
--- a/source3/tdb/tdb.c
+++ b/source3/tdb/tdb.c
@@ -575,9 +575,13 @@ char *tdb_error(TDB_CONTEXT *tdb)
 		{TDB_ERR_OOM, "Out of memory"},
 		{TDB_ERR_EXISTS, "Record exists"},
 		{-1, NULL}};
-	for (i=0;emap[i].estring;i++) {
+        if (tdb != NULL) {
+            for (i=0;emap[i].estring;i++) {
 		if (tdb->ecode == emap[i].ecode) return emap[i].estring;
-	}
+            }
+        } else {
+            return "Invalid tdb context";
+        }
 	return "Invalid error code";
 }