linux-kernel - Re: [PATCH 1/5] perf tools kvm: Add missed memory allocation check and free

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Message-ID: <aJPn1Z5zxqOjZ-Ym@google.com>
Date: Wed, 6 Aug 2025 16:40:05 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Dapeng Mi <dapeng1.mi@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kevin Tian <kevin.tian@...el.com>, Dapeng Mi <dapeng1.mi@...el.com>
Subject: Re: [PATCH 1/5] perf tools kvm: Add missed memory allocation check
 and free

On Tue, Aug 05, 2025 at 08:46:29AM +0800, Dapeng Mi wrote:
> Current code allocates rec_argv[] array, but doesn't check if the
> allocation is successful and explicitly free the rec_argv[] array.
> 
> Add them back.
> 
> Signed-off-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>
> ---
>  tools/perf/builtin-kvm.c | 29 +++++++++++++++++++++++------
>  1 file changed, 23 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 7b15b4a705e4..f78a67a199ff 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -1719,7 +1719,9 @@ kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
>  	set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);
>  
>  	record_usage = kvm_stat_record_usage;
> -	return cmd_record(i, rec_argv);
> +	ret = cmd_record(i, rec_argv);
> +	free(rec_argv);

Well.. it's not enough just to free rec_argv.  You also need to free all
items in the rec_argv[].  Probably you want to add more STRDUP_FAIL_EXIT
when copying the original argv (here and other places).

Thanks,
Namhyung


> +	return ret;
>  }
>  
>  static int
> @@ -2006,6 +2008,9 @@ static int __cmd_record(const char *file_name, int argc, const char **argv)
>  
>  	rec_argc = argc + 2;
>  	rec_argv = calloc(rec_argc + 1, sizeof(char *));
> +	if (!rec_argv)
> +		return -ENOMEM;
> +
>  	rec_argv[i++] = strdup("record");
>  	rec_argv[i++] = strdup("-o");
>  	rec_argv[i++] = strdup(file_name);
> @@ -2014,16 +2019,21 @@ static int __cmd_record(const char *file_name, int argc, const char **argv)
>  
>  	BUG_ON(i != rec_argc);
>  
> -	return cmd_record(i, rec_argv);
> +	ret = cmd_record(i, rec_argv);
> +	free(rec_argv);
> +	return ret;
>  }
>  
>  static int __cmd_report(const char *file_name, int argc, const char **argv)
>  {
> -	int rec_argc, i = 0, j;
> +	int rec_argc, i = 0, j, ret;
>  	const char **rec_argv;
>  
>  	rec_argc = argc + 2;
>  	rec_argv = calloc(rec_argc + 1, sizeof(char *));
> +	if (!rec_argv)
> +		return -ENOMEM;
> +
>  	rec_argv[i++] = strdup("report");
>  	rec_argv[i++] = strdup("-i");
>  	rec_argv[i++] = strdup(file_name);
> @@ -2032,17 +2042,22 @@ static int __cmd_report(const char *file_name, int argc, const char **argv)
>  
>  	BUG_ON(i != rec_argc);
>  
> -	return cmd_report(i, rec_argv);
> +	ret = cmd_report(i, rec_argv);
> +	free(rec_argv);
> +	return ret;
>  }
>  
>  static int
>  __cmd_buildid_list(const char *file_name, int argc, const char **argv)
>  {
> -	int rec_argc, i = 0, j;
> +	int rec_argc, i = 0, j, ret;
>  	const char **rec_argv;
>  
>  	rec_argc = argc + 2;
>  	rec_argv = calloc(rec_argc + 1, sizeof(char *));
> +	if (!rec_argv)
> +		return -ENOMEM;
> +
>  	rec_argv[i++] = strdup("buildid-list");
>  	rec_argv[i++] = strdup("-i");
>  	rec_argv[i++] = strdup(file_name);
> @@ -2051,7 +2066,9 @@ __cmd_buildid_list(const char *file_name, int argc, const char **argv)
>  
>  	BUG_ON(i != rec_argc);
>  
> -	return cmd_buildid_list(i, rec_argv);
> +	ret = cmd_buildid_list(i, rec_argv);
> +	free(rec_argv);
> +	return ret;
>  }
>  
>  int cmd_kvm(int argc, const char **argv)
> -- 
> 2.34.1
>