commit 87a4cd5fbebdd0e6166b421d2c3706bc2f2e5a11
author Serhiy Storchaka <storchaka@gmail.com> Mon Mar 02 09:58:48 2020 +0200
committer GitHub <noreply@github.com> Mon Mar 02 09:58:48 2020 +0200
tree e6b4edd79f7cacf27ea9bc0c13ded2b5b34ce641
parent a7b8a969eb3daacb1fcb029a8c5fecb5d09c964b

bpo-38410: Properly handle PySys_Audit() failures (GH-18658)

_PyEval_SetAsyncGenFinalizer() and _PyEval_SetAsyncGenFirstiter()
didn't include proper error handling for their PySys_Audit() calls.

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Python/sysmodule.c

diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index da4b6e1..b544f2b 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -1178,6 +1178,51 @@
     2
 };
 
+static int
+set_async_gen_firstiter(PyObject *firstiter)
+{
+    PyThreadState *tstate = _PyThreadState_GET();
+
+    if (PySys_Audit("sys.set_asyncgen_hook_firstiter", NULL) < 0) {
+        return -1;
+    }
+
+    Py_XINCREF(firstiter);
+    Py_XSETREF(tstate->async_gen_firstiter, firstiter);
+    return 0;
+}
+
+void
+_PyEval_SetAsyncGenFirstiter(PyObject *firstiter)
+{
+    if (set_async_gen_firstiter(firstiter) < 0) {
+        PyErr_WriteUnraisable(NULL);
+    }
+}
+
+static int
+set_async_gen_finalizer(PyObject *finalizer)
+{
+    PyThreadState *tstate = _PyThreadState_GET();
+
+    if (PySys_Audit("sys.set_asyncgen_hook_finalizer", NULL) < 0) {
+        return -1;
+    }
+
+    Py_XINCREF(finalizer);
+    Py_XSETREF(tstate->async_gen_finalizer, finalizer);
+    return 0;
+}
+
+void
+_PyEval_SetAsyncGenFinalizer(PyObject *finalizer)
+{
+    if (set_async_gen_finalizer(finalizer) < 0) {
+        PyErr_WriteUnraisable(NULL);
+    }
+}
+
+
 static PyObject *
 sys_set_asyncgen_hooks(PyObject *self, PyObject *args, PyObject *kw)
 {
@@ -1198,10 +1243,12 @@
                          Py_TYPE(finalizer)->tp_name);
             return NULL;
         }
-        _PyEval_SetAsyncGenFinalizer(finalizer);
+        if (set_async_gen_finalizer(finalizer) < 0) {
+            return NULL;
+        }
     }
-    else if (finalizer == Py_None) {
-        _PyEval_SetAsyncGenFinalizer(NULL);
+    else if (finalizer == Py_None && set_async_gen_finalizer(NULL) < 0) {
+        return NULL;
     }
 
     if (firstiter && firstiter != Py_None) {
@@ -1211,10 +1258,12 @@
                          Py_TYPE(firstiter)->tp_name);
             return NULL;
         }
-        _PyEval_SetAsyncGenFirstiter(firstiter);
+        if (set_async_gen_firstiter(firstiter) < 0) {
+            return NULL;
+        }
     }
-    else if (firstiter == Py_None) {
-        _PyEval_SetAsyncGenFirstiter(NULL);
+    else if (firstiter == Py_None && set_async_gen_firstiter(NULL) < 0) {
+        return NULL;
     }
 
     Py_RETURN_NONE;