[3.12] gh-132002: Fix crash of `ContextVar` on unhashable `str` subtype (GH-132003) (#132008)

gh-132002: Fix crash of `ContextVar` on unhashable `str` subtype (GH-132003)
(cherry picked from commit ab2a3dda1d3b6668162a847bf5b6aca2855a3416)

Co-authored-by: sobolevn <mail@sobolevn.me>

1 files changed, 6 insertions, 7 deletions

diff --git a/Python/context.c b/Python/context.c
index 7bccfad..e589921 100644
--- a/Python/context.c
+++ b/Python/context.c
@@ -821,20 +821,19 @@ contextvar_new(PyObject *name, PyObject *def)
         return NULL;
     }
 
-    var->var_hash = contextvar_generate_hash(var, name);
-    if (var->var_hash == -1) {
-        Py_DECREF(var);
-        return NULL;
-    }
-
     var->var_name = Py_NewRef(name);
-
     var->var_default = Py_XNewRef(def);
 
     var->var_cached = NULL;
     var->var_cached_tsid = 0;
     var->var_cached_tsver = 0;
 
+    var->var_hash = contextvar_generate_hash(var, name);
+    if (var->var_hash == -1) {
+        Py_DECREF(var);
+        return NULL;
+    }
+
     if (_PyObject_GC_MAY_BE_TRACKED(name) ||
             (def != NULL && _PyObject_GC_MAY_BE_TRACKED(def)))
     {