bpo-35504: Fix segfaults and SystemErrors when deleting certain attrs. (GH-11175)

6 files changed, 32 insertions, 0 deletions

diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c
index 0998cc1..7637cb7 100644
--- a/Modules/_asynciomodule.c
+++ b/Modules/_asynciomodule.c
@@ -1113,6 +1113,10 @@ FutureObj_set_blocking(FutureObj *fut, PyObject *val, void *Py_UNUSED(ignored))
     if (future_ensure_alive(fut)) {
         return -1;
     }
+    if (val == NULL) {
+        PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
+        return -1;
+    }
 
     int is_true = PyObject_IsTrue(val);
     if (is_true < 0) {
@@ -1137,6 +1141,10 @@ FutureObj_get_log_traceback(FutureObj *fut, void *Py_UNUSED(ignored))
 static int
 FutureObj_set_log_traceback(FutureObj *fut, PyObject *val, void *Py_UNUSED(ignored))
 {
+    if (val == NULL) {
+        PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
+        return -1;
+    }
     int is_true = PyObject_IsTrue(val);
     if (is_true < 0) {
         return -1;
@@ -2015,6 +2023,10 @@ TaskObj_get_log_destroy_pending(TaskObj *task, void *Py_UNUSED(ignored))
 static int
 TaskObj_set_log_destroy_pending(TaskObj *task, PyObject *val, void *Py_UNUSED(ignored))
 {
+    if (val == NULL) {
+        PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
+        return -1;
+    }
     int is_true = PyObject_IsTrue(val);
     if (is_true < 0) {
         return -1;
diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index 163b3e3..637be42 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -1191,6 +1191,10 @@ CharArray_set_raw(CDataObject *self, PyObject *value, void *Py_UNUSED(ignored))
     Py_ssize_t size;
     Py_buffer view;
 
+    if (value == NULL) {
+        PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
+        return -1;
+    }
     if (PyObject_GetBuffer(value, &view, PyBUF_SIMPLE) < 0)
         return -1;
     size = view.len;
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index 645d712..14f9488 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -3042,6 +3042,10 @@ textiowrapper_chunk_size_set(textio *self, PyObject *arg, void *context)
 {
     Py_ssize_t n;
     CHECK_ATTACHED_INT(self);
+    if (arg == NULL) {
+        PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
+        return -1;
+    }
     n = PyNumber_AsSsize_t(arg, PyExc_ValueError);
     if (n == -1 && PyErr_Occurred())
         return -1;
diff --git a/Modules/_sqlite/connection.c b/Modules/_sqlite/connection.c
index aab4b1a..e3340bf 100644
--- a/Modules/_sqlite/connection.c
+++ b/Modules/_sqlite/connection.c
@@ -1161,6 +1161,10 @@ static PyObject* pysqlite_connection_get_in_transaction(pysqlite_Connection* sel
 static int
 pysqlite_connection_set_isolation_level(pysqlite_Connection* self, PyObject* isolation_level, void *Py_UNUSED(ignored))
 {
+    if (isolation_level == NULL) {
+        PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
+        return -1;
+    }
     if (isolation_level == Py_None) {
         PyObject *res = pysqlite_connection_commit(self, NULL);
         if (!res) {
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index 269f003..4e3352d 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -3625,6 +3625,10 @@ static int
 set_post_handshake_auth(PySSLContext *self, PyObject *arg, void *c) {
     int (*verify_cb)(int, X509_STORE_CTX *) = NULL;
     int mode = SSL_CTX_get_verify_mode(self->ctx);
+    if (arg == NULL) {
+        PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
+        return -1;
+    }
     int pha = PyObject_IsTrue(arg);
 
     if (pha == -1) {
diff --git a/Modules/cjkcodecs/multibytecodec.c b/Modules/cjkcodecs/multibytecodec.c
index 938a774..f266e5f 100644
--- a/Modules/cjkcodecs/multibytecodec.c
+++ b/Modules/cjkcodecs/multibytecodec.c
@@ -133,6 +133,10 @@ codecctx_errors_set(MultibyteStatefulCodecContext *self, PyObject *value,
     PyObject *cb;
     const char *str;
 
+    if (value == NULL) {
+        PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
+        return -1;
+    }
     if (!PyUnicode_Check(value)) {
         PyErr_SetString(PyExc_TypeError, "errors must be a string");
         return -1;