Re: [PATCH v2] perf jevents: Fix resource leak in process_mapfile() and main()

[Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>]

Em Wed, Oct 16, 2019 at 09:50:17PM +0800, Yunfeng Ye escreveu:
> There are memory leaks and file descriptor resource leaks in
> process_mapfile() and main().
> 
> Fix this by adding free(), fclose() and free_arch_std_events()
> on the error paths.
> 
> Fixes: 80eeb67fe577 ("perf jevents: Program to convert JSON file")
> Fixes: 3f056b66647b ("perf jevents: Make build fail on JSON parse error")
> Fixes: e9d32c1bf0cd ("perf vendor events: Add support for arch standard events")

Nice, thanks for adding the fixes line, I looked at those three patches
and indeed they were leaky, thanks for the fixes, we shouldn't have
those leaks even if that, for now, makes the tool to end anyway.

- Arnaldo

> Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
> ---
> v1 -> v2:
>  - add free(eventsfp) to fix eventsfp resource leaks
>  - add free_arch_std_events() on the error path
> 
>  tools/perf/pmu-events/jevents.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
> index e2837260ca4d..99e3fd04a5cb 100644
> --- a/tools/perf/pmu-events/jevents.c
> +++ b/tools/perf/pmu-events/jevents.c
> @@ -758,6 +758,7 @@ static int process_mapfile(FILE *outfp, char *fpath)
>  	char *line, *p;
>  	int line_num;
>  	char *tblname;
> +	int ret = 0;
> 
>  	pr_info("%s: Processing mapfile %s\n", prog, fpath);
> 
> @@ -769,6 +770,7 @@ static int process_mapfile(FILE *outfp, char *fpath)
>  	if (!mapfp) {
>  		pr_info("%s: Error %s opening %s\n", prog, strerror(errno),
>  				fpath);
> +		free(line);
>  		return -1;
>  	}
> 
> @@ -795,7 +797,8 @@ static int process_mapfile(FILE *outfp, char *fpath)
>  			/* TODO Deal with lines longer than 16K */
>  			pr_info("%s: Mapfile %s: line %d too long, aborting\n",
>  					prog, fpath, line_num);
> -			return -1;
> +			ret = -1;
> +			goto out;
>  		}
>  		line[strlen(line)-1] = '\0';
> 
> @@ -825,7 +828,9 @@ static int process_mapfile(FILE *outfp, char *fpath)
> 
>  out:
>  	print_mapping_table_suffix(outfp);
> -	return 0;
> +	fclose(mapfp);
> +	free(line);
> +	return ret;
>  }
> 
>  /*
> @@ -1122,6 +1127,7 @@ int main(int argc, char *argv[])
>  		goto empty_map;
>  	} else if (rc < 0) {
>  		/* Make build fail */
> +		fclose(eventsfp);
>  		free_arch_std_events();
>  		return 1;
>  	} else if (rc) {
> @@ -1134,6 +1140,7 @@ int main(int argc, char *argv[])
>  		goto empty_map;
>  	} else if (rc < 0) {
>  		/* Make build fail */
> +		fclose(eventsfp);
>  		free_arch_std_events();
>  		return 1;
>  	} else if (rc) {
> @@ -1151,6 +1158,8 @@ int main(int argc, char *argv[])
>  	if (process_mapfile(eventsfp, mapfile)) {
>  		pr_info("%s: Error processing mapfile %s\n", prog, mapfile);
>  		/* Make build fail */
> +		fclose(eventsfp);
> +		free_arch_std_events();
>  		return 1;
>  	}
> 
> -- 
> 2.7.4.3

-- 

- Arnaldo