[3.12] gh-129409: Fix Integer overflow - SEGV while writing data more than 2GB in...

gh-129409: Fix Integer overflow -  SEGV while writing data more than 2GB in CSV file (GH-129413)
(cherry picked from commit 97b0ef05d987ebef354512b516a246feb411e815)

Co-authored-by: Srinivas Reddy Thatiparthy (తాటిపర్తి శ్రీనివాస్  రెడ్డి) <thatiparthysreenivas@gmail.com>

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
new file mode 100644 (file)
index 0000000..7e00b44
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-01-29-14-30-54.gh-issue-129409.JZbOE6.rst
@@ -0,0 +1,2 @@
+Fix an integer overflow in the :mod:`csv` module when writing a data field
+larger than 2GB.

diff --git a/Modules/_csv.c b/Modules/_csv.c
index 9a7b7d27c2ed39a7b693aa0b44e3ce45de44d13c..df7207d0894af861846842dcbae536233bf9eca5 100644 (file)
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -1074,7 +1074,7 @@ 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 \