linux-kernel - Re: [PATCH] perf test: Fix undefined behavior in bp

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Date:   Fri, 10 Jun 2022 15:41:08 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf test: Fix undefined behavior in bp_account

Em Fri, Jun 10, 2022 at 11:02:47AM -0700, Ian Rogers escreveu:
> Fix:
> tests/bp_account.c:154:9: runtime error: variable length array bound evaluates to non-positive value 0
> by switching from a variable length to an allocated array.

Thanks, applied.

- Arnaldo

 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/tests/bp_account.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/tests/bp_account.c b/tools/perf/tests/bp_account.c
> index d1ebb5561e5b..6f921db33cf9 100644
> --- a/tools/perf/tests/bp_account.c
> +++ b/tools/perf/tests/bp_account.c
> @@ -151,11 +151,21 @@ static int detect_ioctl(void)
>  static int detect_share(int wp_cnt, int bp_cnt)
>  {
>  	struct perf_event_attr attr;
> -	int i, fd[wp_cnt + bp_cnt], ret;
> +	int i, *fd = NULL, ret = -1;
> +
> +	if (wp_cnt + bp_cnt == 0)
> +		return 0;
> +
> +	fd = malloc(sizeof(int) * (wp_cnt + bp_cnt));
> +	if (!fd)
> +		return -1;
>  
>  	for (i = 0; i < wp_cnt; i++) {
>  		fd[i] = wp_event((void *)&the_var, &attr);
> -		TEST_ASSERT_VAL("failed to create wp\n", fd[i] != -1);
> +		if (fd[i] == -1) {
> +			pr_err("failed to create wp\n");
> +			goto out;
> +		}
>  	}
>  
>  	for (; i < (bp_cnt + wp_cnt); i++) {
> @@ -166,9 +176,11 @@ static int detect_share(int wp_cnt, int bp_cnt)
>  
>  	ret = i != (bp_cnt + wp_cnt);
>  
> +out:
>  	while (i--)
>  		close(fd[i]);
>  
> +	free(fd);
>  	return ret;
>  }
>  
> -- 
> 2.36.1.476.g0c4daa206d-goog

-- 

- Arnaldo