linux-kernel - Re: [PATCH] perf tools: fix resource leak of closedir() on the error paths

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Date:   Tue, 15 Oct 2019 10:44:51 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Yunfeng Ye <yeyunfeng@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        namhyung@...nel.org, ast@...nel.org, daniel@...earbox.net,
        kafai@...com, songliubraving@...com, yhs@...com,
        ilubashe@...mai.com, ak@...ux.intel.com, kan.liang@...ux.intel.com,
        alexey.budankov@...ux.intel.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org, hushiyuan@...wei.com,
        linfeilong@...wei.com
Subject: Re: [PATCH] perf tools: fix resource leak of closedir() on the error
 paths

On Tue, Oct 15, 2019 at 04:30:08PM +0800, Yunfeng Ye wrote:
> Both build_mem_topology() and rm_rf_depth_pat() have resource leak of
> closedir() on the error paths.
> 
> Fix this by calling closedir() before function returns.
> 
> Fixes: e2091cedd51b ("perf tools: Add MEM_TOPOLOGY feature to perf data file")
> Fixes: cdb6b0235f17 ("perf tools: Add pattern name checking to rm_rf")

guilty as charged ;-)

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka


> Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com>
> ---
>  tools/perf/util/header.c | 4 +++-
>  tools/perf/util/util.c   | 6 ++++--
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 86d9396..becc2d1 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -1296,8 +1296,10 @@ static int build_mem_topology(struct memory_node *nodes, u64 size, u64 *cntp)
>  			continue;
> 
>  		if (WARN_ONCE(cnt >= size,
> -			      "failed to write MEM_TOPOLOGY, way too many nodes\n"))
> +			"failed to write MEM_TOPOLOGY, way too many nodes\n")) {
> +			closedir(dir);
>  			return -1;
> +		}
> 
>  		ret = memory_node__read(&nodes[cnt++], idx);
>  	}
> diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> index 5eda6e1..ae56c76 100644
> --- a/tools/perf/util/util.c
> +++ b/tools/perf/util/util.c
> @@ -154,8 +154,10 @@ static int rm_rf_depth_pat(const char *path, int depth, const char **pat)
>  		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
>  			continue;
> 
> -		if (!match_pat(d->d_name, pat))
> -			return -2;
> +		if (!match_pat(d->d_name, pat)) {
> +			ret =  -2;
> +			break;
> +		}
> 
>  		scnprintf(namebuf, sizeof(namebuf), "%s/%s",
>  			  path, d->d_name);
> -- 
> 2.7.4.huawei.3
>