From: Yicong Yang <yangyicong@hisilicon.com>

When dump the raw trace by `perf report -D` ASan reports a memory
leakage in perf_event__fprintf_event_update(). It shows that we
allocated a temporary cpumap for dumping the CPUs but doesn't
release it and it's not used elsewhere. Fix this by free the
cpumap after the dumping.

Fixes: c853f9394b7b ("perf tools: Add perf_event__fprintf_event_update function")
Cc: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
---
 tools/perf/util/header.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index e86b9439ffee..7190f39ccd13 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -4369,9 +4369,10 @@ size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
 		ret += fprintf(fp, "... ");
 
 		map = cpu_map__new_data(&ev->cpus.cpus);
-		if (map)
+		if (map) {
 			ret += cpu_map__fprintf(map, fp);
-		else
+			perf_cpu_map__put(map);
+		} else
 			ret += fprintf(fp, "failed to get cpus\n");
 		break;
 	default:
-- 
2.24.0

Hello,

On Thu, Dec 7, 2023 at 12:20 AM Yicong Yang <yangyicong@huawei.com> wrote:
>
> From: Yicong Yang <yangyicong@hisilicon.com>
>
> When dump the raw trace by `perf report -D` ASan reports a memory
> leakage in perf_event__fprintf_event_update(). It shows that we
> allocated a temporary cpumap for dumping the CPUs but doesn't
> release it and it's not used elsewhere. Fix this by free the
> cpumap after the dumping.
>
> Fixes: c853f9394b7b ("perf tools: Add perf_event__fprintf_event_update function")
> Cc: Jiri Olsa <jolsa@kernel.org>
> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>

Acked-by: Namhyung Kim <namhyung@kernel.org>

Thanks,
Namhyung


> ---
>  tools/perf/util/header.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index e86b9439ffee..7190f39ccd13 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -4369,9 +4369,10 @@ size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
>                 ret += fprintf(fp, "... ");
>
>                 map = cpu_map__new_data(&ev->cpus.cpus);
> -               if (map)
> +               if (map) {
>                         ret += cpu_map__fprintf(map, fp);
> -               else
> +                       perf_cpu_map__put(map);
> +               } else
>                         ret += fprintf(fp, "failed to get cpus\n");
>                 break;
>         default:
> --
> 2.24.0
>
>