Issue #14433: Prevent msvcrt crash in interactive prompt when stdin is closed.

2 files changed, 7 insertions, 1 deletions

diff --git a/Misc/NEWS b/Misc/NEWS
index 53aa074..3b896d1 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@ What's New in Python 3.2.4
 Core and Builtins
 -----------------
 
+- Issue #14433: Prevent msvcrt crash in interactive prompt when stdin
+  is closed.
+
 - Issue #11603 (again): Setting __repr__ to __str__ now raises a RuntimeError
   when repr() or str() is called on such an object.
 
diff --git a/Parser/myreadline.c b/Parser/myreadline.c
index 33d5b3d..cb1cf0f 100644
--- a/Parser/myreadline.c
+++ b/Parser/myreadline.c
@@ -42,7 +42,10 @@ my_fgets(char *buf, int len, FILE *fp)
             (void)(PyOS_InputHook)();
         errno = 0;
         clearerr(fp);
-        p = fgets(buf, len, fp);
+        if (_PyVerify_fd(fileno(fp)))
+            p = fgets(buf, len, fp);
+        else
+            p = NULL;
         if (p != NULL)
             return 0; /* No error */
         err = errno;