linux-kernel - Re: [PATCH 2/4] perf svghelper: Fix memory leak in svg_build_topology

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Date:   Thu, 21 May 2020 11:15:45 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Wei Li <liwei391@...wei.com>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, Li Bin <huawei.libin@...wei.com>,
        Xie XiuQi <xiexiuqi@...wei.com>,
        Hongbo Yao <yaohongbo@...wei.com>
Subject: Re: [PATCH 2/4] perf svghelper: Fix memory leak in
 svg_build_topology_map

Em Thu, May 21, 2020 at 09:32:16PM +0800, Wei Li escreveu:
> From: Li Bin <huawei.libin@...wei.com>
> 
> Fix leak of memory pointed to by t.sib_thr and t.sib_core in
> svg_build_topology_map.
> 
> Signed-off-by: Li Bin <huawei.libin@...wei.com>
> ---
>  tools/perf/util/svghelper.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
> index 96f941e01681..e2b3b0e2fafe 100644
> --- a/tools/perf/util/svghelper.c
> +++ b/tools/perf/util/svghelper.c
> @@ -754,6 +754,7 @@ int svg_build_topology_map(struct perf_env *env)
>  	int i, nr_cpus;
>  	struct topology t;
>  	char *sib_core, *sib_thr;
> +	int ret;

Please set ret to -1 here

	int ret = -1;
	
So that you don't have to add all those lines below...

>  
>  	nr_cpus = min(env->nr_cpus_online, MAX_NR_CPUS);
>  
> @@ -767,12 +768,14 @@ int svg_build_topology_map(struct perf_env *env)
>  
>  	if (!t.sib_core || !t.sib_thr) {
>  		fprintf(stderr, "topology: no memory\n");
> +		ret = -1;
>  		goto exit;
>  	}
>  
>  	for (i = 0; i < env->nr_sibling_cores; i++) {
>  		if (str_to_bitmap(sib_core, &t.sib_core[i], nr_cpus)) {
>  			fprintf(stderr, "topology: can't parse siblings map\n");
> +			ret = -1;
>  			goto exit;
>  		}
>  
> @@ -782,6 +785,7 @@ int svg_build_topology_map(struct perf_env *env)
>  	for (i = 0; i < env->nr_sibling_threads; i++) {
>  		if (str_to_bitmap(sib_thr, &t.sib_thr[i], nr_cpus)) {
>  			fprintf(stderr, "topology: can't parse siblings map\n");
> +			ret = -1;
>  			goto exit;
>  		}
>  
> @@ -791,6 +795,7 @@ int svg_build_topology_map(struct perf_env *env)
>  	topology_map = malloc(sizeof(int) * nr_cpus);
>  	if (!topology_map) {
>  		fprintf(stderr, "topology: no memory\n");
> +		ret = -1;
>  		goto exit;
>  	}
>  
> @@ -798,12 +803,11 @@ int svg_build_topology_map(struct perf_env *env)
>  		topology_map[i] = -1;
>  
>  	scan_core_topology(topology_map, &t, nr_cpus);
> -
> -	return 0;

... as you'll set it to zero here :-)

> +	ret = 0;
>  
>  exit:
>  	zfree(&t.sib_core);
>  	zfree(&t.sib_thr);
>  
> -	return -1;
> +	return ret;
>  }
> -- 
> 2.17.1
> 

-- 

- Arnaldo