linux-kernel - Re: [PATCH v1 1/3] lib subcmd: Fix memory leak in uniq

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Date: Tue, 2 Jan 2024 11:30:39 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>, 
	Adrian Hunter <adrian.hunter@...el.com>, Chenyuan Mi <cymi20@...an.edu.cn>, 
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v1 1/3] lib subcmd: Fix memory leak in uniq

On Thu, Dec 7, 2023 at 4:05 PM Ian Rogers <irogers@...gle.com> wrote:
>
> uniq will write one command name over another causing the overwritten
> string to be leaked. Fix by doing a pass that removes duplicates and a
> second that removes the holes.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Ping for this series, no comments since sent.

Thanks,
Ian

> ---
>  tools/lib/subcmd/help.c | 18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)
>
> diff --git a/tools/lib/subcmd/help.c b/tools/lib/subcmd/help.c
> index adfbae27dc36..8561b0f01a24 100644
> --- a/tools/lib/subcmd/help.c
> +++ b/tools/lib/subcmd/help.c
> @@ -52,11 +52,21 @@ void uniq(struct cmdnames *cmds)
>         if (!cmds->cnt)
>                 return;
>
> -       for (i = j = 1; i < cmds->cnt; i++)
> -               if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
> -                       cmds->names[j++] = cmds->names[i];
> -
> +       for (i = 1; i < cmds->cnt; i++) {
> +               if (!strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
> +                       zfree(&cmds->names[i - 1]);
> +       }
> +       for (i = 0, j = 0; i < cmds->cnt; i++) {
> +               if (cmds->names[i]) {
> +                       if (i == j)
> +                               j++;
> +                       else
> +                               cmds->names[j++] = cmds->names[i];
> +               }
> +       }
>         cmds->cnt = j;
> +       while (j < i)
> +               cmds->names[j++] = NULL;
>  }
>
>  void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
> --
> 2.43.0.472.g3155946c3a-goog
>