linux-kernel - Re: [PATCH v2 04/18] perf hisi-ptt: Fix potential memory leak

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Date:   Sun, 8 Oct 2023 22:41:40 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Yicong Yang <yangyicong@...ilicon.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ming Wang <wangming01@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Yuan Can <yuancan@...wei.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        James Clark <james.clark@....com>, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v2 04/18] perf hisi-ptt: Fix potential memory leak

On Thu, Oct 5, 2023 at 4:09 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Fix clang-tidy found potential memory leak and unread value:
> ```
> tools/perf/util/hisi-ptt.c:108:3: warning: Value stored to 'data_offset' is never read [clang-analyzer-deadcode.DeadStores]
>                 data_offset = 0;
>                 ^             ~
> tools/perf/util/hisi-ptt.c:108:3: note: Value stored to 'data_offset' is never read
>                 data_offset = 0;
>                 ^             ~
> tools/perf/util/hisi-ptt.c:112:12: warning: Potential leak of memory pointed to by 'data' [clang-analyzer-unix.Malloc]
>                         return -errno;
>                                 ^
> /usr/include/errno.h:38:18: note: expanded from macro 'errno'
>                  ^
> tools/perf/util/hisi-ptt.c:100:15: note: Memory is allocated
>         void *data = malloc(size);
>                      ^~~~~~~~~~~~
> tools/perf/util/hisi-ptt.c:104:6: note: Assuming 'data' is non-null
>         if (!data)
>             ^~~~~
> tools/perf/util/hisi-ptt.c:104:2: note: Taking false branch
>         if (!data)
>         ^
> tools/perf/util/hisi-ptt.c:107:6: note: Assuming the condition is false
>         if (perf_data__is_pipe(session->data)) {
>             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> tools/perf/util/hisi-ptt.c:107:2: note: Taking false branch
>         if (perf_data__is_pipe(session->data)) {
>         ^
> tools/perf/util/hisi-ptt.c:111:7: note: Assuming the condition is true
>                 if (data_offset == -1)
>                     ^~~~~~~~~~~~~~~~~
> tools/perf/util/hisi-ptt.c:111:3: note: Taking true branch
>                 if (data_offset == -1)
>                 ^
> tools/perf/util/hisi-ptt.c:112:12: note: Potential leak of memory pointed to by 'data'
>                         return -errno;
>                                 ^
> /usr/include/errno.h:38:18: note: expanded from macro 'errno'
> ```

We already have

  https://lore.kernel.org/r/20230930072719.1267784-1-visitorckw@gmail.com

Thanks,
Namhyung


>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/hisi-ptt.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/tools/perf/util/hisi-ptt.c b/tools/perf/util/hisi-ptt.c
> index 45b614bb73bf..ea297329c526 100644
> --- a/tools/perf/util/hisi-ptt.c
> +++ b/tools/perf/util/hisi-ptt.c
> @@ -98,18 +98,18 @@ static int hisi_ptt_process_auxtrace_event(struct perf_session *session,
>         int fd = perf_data__fd(session->data);
>         int size = event->auxtrace.size;
>         void *data = malloc(size);
> -       off_t data_offset;
>         int err;
>
>         if (!data)
>                 return -errno;
>
> -       if (perf_data__is_pipe(session->data)) {
> -               data_offset = 0;
> -       } else {
> -               data_offset = lseek(fd, 0, SEEK_CUR);
> -               if (data_offset == -1)
> +       if (!perf_data__is_pipe(session->data)) {
> +               off_t data_offset = lseek(fd, 0, SEEK_CUR);
> +
> +               if (data_offset == -1) {
> +                       free(data);
>                         return -errno;
> +               }
>         }
>
>         err = readn(fd, data, size);
> --
> 2.42.0.609.gbb76f46606-goog
>