[PATCH libgpiod v2 1/4] bindings: python: gpiod: avoid use after free

[Iker Pedrosa <ikerpedrosam@xxxxxxxxx>]

`req_cfg` variable is freed and then used, which would generate an
error. Avoid this problem by freeing when the variable will no longer be
used.

Signed-off-by: Iker Pedrosa <ikerpedrosam@xxxxxxxxx>
Reviewed-by: Kent Gibson <warthog618@xxxxxxxxx>
---
 bindings/python/gpiod/ext/chip.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/bindings/python/gpiod/ext/chip.c b/bindings/python/gpiod/ext/chip.c
index 28cf504..e8eaad8 100644
--- a/bindings/python/gpiod/ext/chip.c
+++ b/bindings/python/gpiod/ext/chip.c
@@ -274,14 +274,16 @@ static PyObject *chip_request_lines(chip_object *self, PyObject *args)
 	Py_BEGIN_ALLOW_THREADS;
 	request = gpiod_chip_request_lines(self->chip, req_cfg, line_cfg);
 	Py_END_ALLOW_THREADS;
-	gpiod_request_config_free(req_cfg);
-	if (!request)
+	if (!request) {
+		gpiod_request_config_free(req_cfg);
 		return Py_gpiod_SetErrFromErrno();
+	}
 
 	req_obj = Py_gpiod_MakeRequestObject(request,
 			gpiod_request_config_get_event_buffer_size(req_cfg));
 	if (!req_obj)
 		gpiod_line_request_release(request);
+	gpiod_request_config_free(req_cfg);
 
 	return req_obj;
 }
-- 
2.45.2