[3.13] Fix possible null pointer dereference of freevars in _PyCompile_LookupArg (gh-126238) (#126475)

federicovalenso · blurb-it[bot] · ZeroIntensity · web-flow · commit 8059351051e8 · 2024-11-06T08:10:04.000Z
[3.13] gh-126238: Fix possible null pointer dereference of freevars in _PyCompile_LookupArg (GH-126239) * Replace Py_DECREF by Py_XDECREF (cherry picked from commit 8525c93) Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com> Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
diff --git a/Python/compile.c b/Python/compile.c
@@ -1815,7 +1815,7 @@ compiler_make_closure(struct compiler *c, location loc,
                     c->u->u_metadata.u_name,
                     co->co_name,
                     freevars);
-                Py_DECREF(freevars);
+                Py_XDECREF(freevars);
                 return ERROR;
             }
             ADDOP_I(c, loc, LOAD_CLOSURE, arg);

Original file line number	Diff line number	Diff line change
`@@ -1815,7 +1815,7 @@ compiler_make_closure(struct compiler *c, location loc,`
`1815`	`1815`	`c->u->u_metadata.u_name,`
`1816`	`1816`	`co->co_name,`
`1817`	`1817`	`freevars);`
`1818`		`- Py_DECREF(freevars);`
	`1818`	`+ Py_XDECREF(freevars);`
`1819`	`1819`	`return ERROR;`
`1820`	`1820`	`}`
`1821`	`1821`	`ADDOP_I(c, loc, LOAD_CLOSURE, arg);`