schema compile BUGFIX invalid identity exts parent pointers

Refs #2447

Author: michalvasko

src/schema_compile.c

@@ -177,7 +177,7 @@ LY_ERR
 lys_identity_precompile(struct lysc_ctx *ctx_sc, struct ly_ctx *ctx, struct lysp_module *parsed_mod,
         const struct lysp_ident *identities_p, struct lysc_ident **identities)
 {
-    LY_ARRAY_COUNT_TYPE u;
+    LY_ARRAY_COUNT_TYPE u, v;
     struct lysc_ctx cctx = {0};
     struct lysc_ident *ident;
     LY_ERR ret = LY_SUCCESS;
@@ -216,6 +216,13 @@ lys_identity_precompile(struct lysc_ctx *ctx_sc, struct ly_ctx *ctx, struct lysp
     }
     lysc_update_path(ctx_sc, NULL, NULL);
 
+    /* revalidate the backward parent pointers from extensions now that the array is final */
+    LY_ARRAY_FOR(*identities, u) {
+        LY_ARRAY_FOR((*identities)[u].exts, v) {
+            (*identities)[u].exts[v].parent = &(*identities)[u];
+        }
+    }
+
 done:
     if (ret) {
         lysc_update_path(ctx_sc, NULL, NULL);

tests/utests/schema/test_schema.c

@@ -2139,8 +2139,8 @@ test_compiled_print(void **state)
     yang = "module m1 {yang-version 1.1; namespace urn:m1;prefix m1;"
             "import ietf-yang-metadata {prefix md;}"
             "extension a;"
-            "identity baseid;"
-            "identity id1 {base baseid;}"
+            "identity baseid {m1:a;}"
+            "identity id1 {base baseid; m1:a;}"
             "feature feat;"
             "container root {"
             "leaf a {type instance-identifier;}"