bpo-37072: Fix crash in PyAST_FromNodeObject() when flags is NULL (#13634)
I'm confident that this fixes the reported crash. flags=NULL is treated as using the latest minor version.
https://bugs.python.org/issue37072
diff --git a/Misc/NEWS.d/next/Core and Builtins/2019-05-28-18-18-55.bpo-37072.1Hewl3.rst b/Misc/NEWS.d/next/Core and Builtins/2019-05-28-18-18-55.bpo-37072.1Hewl3.rst
new file mode 100644
index 0000000..15bcc5e
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2019-05-28-18-18-55.bpo-37072.1Hewl3.rst
@@ -0,0 +1 @@
+Fix crash in PyAST_FromNodeObject() when flags is NULL.
\ No newline at end of file
diff --git a/Python/ast.c b/Python/ast.c
index 7ffdf4a..12a45f9 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -786,7 +786,7 @@
/* borrowed reference */
c.c_filename = filename;
c.c_normalize = NULL;
- c.c_feature_version = flags->cf_feature_version;
+ c.c_feature_version = flags ? flags->cf_feature_version : PY_MINOR_VERSION;
if (TYPE(n) == encoding_decl)
n = CHILD(n, 0);