gh-129409: Fix Integer overflow - SEGV while writing data more than 2GB in CSV file (#129413)

srinivasreddy · web-flow · commit 97b0ef05d987 · 2025-01-29T11:15:47.000Z
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 @@
+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
@@ -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 \

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Fix an integer overflow in the :mod:`csv` module when writing a data field
	`2`	`+larger than 2GB.`
Original file line number	Diff line number	Diff line change
`@@ -1138,7 +1138,7 @@ join_append_data(WriterObj self, int field_kind, const void field_data,`
`1138`	`1138`	`int copy_phase)`
`1139`	`1139`	`{`
`1140`	`1140`	`DialectObj *dialect = self->dialect;`
`1141`		`- int i;`
	`1141`	`+ Py_ssize_t i;`
`1142`	`1142`	`Py_ssize_t rec_len;`
`1143`	`1143`
`1144`	`1144`	`#define INCLEN \`