python · sobolevn · Jan 29, 2025 · Jan 28, 2025 · Jan 28, 2025 · Jan 29, 2025
diff --git a/Misc/NEWS.d/next/Library/2025-01-29-14-30-54.gh-issue-129409.JZbOE6.rst b/Misc/NEWS.d/next/Library/2025-01-29-14-30-54.gh-issue-129409.JZbOE6.rst
@@ -0,0 +1,2 @@
+Fixed a segmentation fault in the :mod:`csv` module when writing data fields
+larger than 2GB due to integer overflow.
-Fixed a segmentation fault in the :mod:`csv` module when writing data fields
-larger than 2GB due to integer overflow.
+Fix an integer overflow in the :mod:`csv` module when writing data
+larger than 2GB.
-Fixed a segmentation fault in the :mod:`csv` module when writing data fields
-larger than 2GB due to integer overflow.
+Fix an integer overflow in the :mod:`csv` module when writing data
+larger than 2GB.
diff --git a/Modules/_csv.c b/Modules/_csv.c
@@ -1138,7 +1138,7 @@ join_append_data(WriterObj *self, int field_kind, const void *field_data,
                  int copy_phase)
 {
     DialectObj *dialect = self->dialect;
-    int i;
+    Py_ssize_t i;
     Py_ssize_t rec_len;
 
 #define INCLEN \