[issue35720] Memory leak in Modules/main.c:pymain_parse_cmdline_impl when using the CLI flag

[Lucas Cimon]

New submission from Lucas Cimon <lucas.cimon at gmail.com>:

Hi.

I think I have found a minor memory leak in Modules/main.c:pymain_parse_cmdline_impl.

When the loop in the pymain_read_conf function in this same file
calls pymain_init_cmdline_argv a 2nd time, the pymain->command
buffer of wchar_t is overriden and the previously allocated memory
is never freed.

I haven't written any code test to reproduce this,
but it can be tested easily with gdb:
```
gdb -- bin/python3 -c pass
start
b Modules/main.c:587
b pymain_clear_pymain
c
c
```
You'll see that PyMem_RawMalloc is called twice without pymain->command ever being freed in pymain_clear_pymain.

I have a patch coming as PR on GitHub

I'd be glad to have your feedback on this issue and my proposal for a fix.

Regards.

----------
messages: 333499
nosy: Lucas Cimon
priority: normal
severity: normal
status: open
title: Memory leak in Modules/main.c:pymain_parse_cmdline_impl when using the CLI flag

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35720>
_______________________________________