tests/cmdline: fix memory leaks

  From: Owen Hilyard <ohilyard@iol.unh.edu>

Fixes for a few memory leaks in the cmdline_autotest unit test.

All of the leaks were related to not freeing the commandline struct
after testing had completed.

Signed-off-by: Owen Hilyard <ohilyard@iol.unh.edu>
---
 app/test/test_cmdline_lib.c | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)
  

On Wed, Jun 16, 2021 at 6:26 PM <ohilyard@iol.unh.edu> wrote:
>
> From: Owen Hilyard <ohilyard@iol.unh.edu>
>
> Fixes for a few memory leaks in the cmdline_autotest unit test.
>
> All of the leaks were related to not freeing the commandline struct
> after testing had completed.

We will need a Fixes: tag and Cc: stable.


>
> Signed-off-by: Owen Hilyard <ohilyard@iol.unh.edu>
> ---
>  app/test/test_cmdline_lib.c | 32 ++++++++++++++++++++++++--------
>  1 file changed, 24 insertions(+), 8 deletions(-)
>
> diff --git a/app/test/test_cmdline_lib.c b/app/test/test_cmdline_lib.c
> index bd72df0da..fd0a797c1 100644
> --- a/app/test/test_cmdline_lib.c
> +++ b/app/test/test_cmdline_lib.c
> @@ -71,10 +71,12 @@ test_cmdline_parse_fns(void)
>         if (cmdline_complete(cl, "buffer", &i, NULL, sizeof(dst)) >= 0)
>                 goto error;
>
> +       cmdline_free(cl);
>         return 0;
>
>  error:
>         printf("Error: function accepted null parameter!\n");
> +       cmdline_free(cl);
>         return -1;
>  }
>
> @@ -140,32 +142,45 @@ static int
>  test_cmdline_socket_fns(void)
>  {
>         cmdline_parse_ctx_t ctx;
> +       struct cmdline *cl;
>
> -       if (cmdline_stdin_new(NULL, "prompt") != NULL)
> +       cl = cmdline_stdin_new(NULL, "prompt");
> +       if (cl != NULL)
>                 goto error;
> -       if (cmdline_stdin_new(&ctx, NULL) != NULL)
> +       cl = cmdline_stdin_new(&ctx, NULL);
> +       if (cl != NULL)
>                 goto error;
> -       if (cmdline_file_new(NULL, "prompt", "/dev/null") != NULL)
> +       cl = cmdline_file_new(NULL, "prompt", "/dev/null");
> +       if (cl != NULL)
>                 goto error;
> -       if (cmdline_file_new(&ctx, NULL, "/dev/null") != NULL)
> +       cl = cmdline_file_new(&ctx, NULL, "/dev/null");
> +       if (cl != NULL)
>                 goto error;
> -       if (cmdline_file_new(&ctx, "prompt", NULL) != NULL)
> +       cl = cmdline_file_new(&ctx, "prompt", NULL);
> +       if (cl != NULL)
>                 goto error;
> -       if (cmdline_file_new(&ctx, "prompt", "-/invalid/~/path") != NULL) {
> +       cl = cmdline_file_new(&ctx, "prompt", "-/invalid/~/path");
> +       if (cl != NULL) {
>                 printf("Error: succeeded in opening invalid file for reading!");
> +               cmdline_free(cl);
>                 return -1;
>         }
> -       if (cmdline_file_new(&ctx, "prompt", "/dev/null") == NULL) {
> +       cl = cmdline_file_new(&ctx, "prompt", "/dev/null");
> +       if (cl == NULL) {
>                 printf("Error: failed to open /dev/null for reading!");
> +               cmdline_free(cl);
>                 return -1;
>         }
>
>         /* void functions */
>         cmdline_stdin_exit(NULL);
> -
> +       if (cl != NULL)
> +               cmdline_free(cl);

We made sure cl != NULL above, no need for this test.


>         return 0;
>  error:
>         printf("Error: function accepted null parameter!\n");
> +       if (cl != NULL)
> +               cmdline_free(cl);

And anyway, cmdline_free() handles a NULL pointer fine, so you can
also remove the check here.

With commitlog updated and those two changes, you can add my:
Reviewed-by: David Marchand <david.marchand@redhat.com>

>         return -1;
>  }
>
> @@ -198,6 +213,7 @@ test_cmdline_fns(void)
>         cmdline_interact(NULL);
>         cmdline_quit(NULL);
>
> +       cmdline_free(cl);
>         return 0;
>
>  error:
> --
> 2.30.2
>