refs: Don't allow references to inexistent OIDs
diff --git a/src/refs.c b/src/refs.c
index c6508ca..8170695 100644
--- a/src/refs.c
+++ b/src/refs.c
@@ -1319,6 +1319,13 @@ int git_reference_set_oid(git_reference *ref, const git_oid *id)
ref_oid = (reference_oid *)ref;
+ assert(ref->owner);
+
+ /* Don't let the user create references to OIDs that
+ * don't exist in the ODB */
+ if (!git_odb_exists(git_repository_database(ref->owner), id))
+ return GIT_ENOTFOUND;
+
/* duplicate the reference;
* this copy will stay on the packfile cache */
if (ref->type & GIT_REF_PACKED) {