linux-kernel - Re: [PATCH] tools: Fix incorrect calculation of object size by sizeof

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Date:   Tue, 20 Jun 2023 12:19:07 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Li Dong <lidong@...o.com>
Cc:     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>, Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        "open list:PERFORMANCE EVENTS SUBSYSTEM" 
        <linux-perf-users@...r.kernel.org>,
        "open list:PERFORMANCE EVENTS SUBSYSTEM" 
        <linux-kernel@...r.kernel.org>, opensource.kernel@...o.com
Subject: Re: [PATCH] tools: Fix incorrect calculation of object size by sizeof

Hello,

On Mon, Jun 19, 2023 at 1:21 AM Li Dong <lidong@...o.com> wrote:
>
> What we need to calculate is the size of the object, not the size of the
> pointer.
>
> Signed-off-by: Li Dong <lidong@...o.com>

Since this problem was introduced in the current dev cycle and not in the
mainline yet, I think we can skip the Fixes tag.

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

Thanks,
Namhyung


> ---
>  tools/perf/util/scripting-engines/trace-event-python.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
> index 59063ec98619..25fcd6630a4d 100644
> --- a/tools/perf/util/scripting-engines/trace-event-python.c
> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> @@ -771,12 +771,12 @@ static void set_regs_in_dict(PyObject *dict,
>         int size = __sw_hweight64(attr->sample_regs_intr) * 28;
>         char *bf = malloc(size);
>
> -       regs_map(&sample->intr_regs, attr->sample_regs_intr, arch, bf, sizeof(bf));
> +       regs_map(&sample->intr_regs, attr->sample_regs_intr, arch, bf, size);
>
>         pydict_set_item_string_decref(dict, "iregs",
>                         _PyUnicode_FromString(bf));
>
> -       regs_map(&sample->user_regs, attr->sample_regs_user, arch, bf, sizeof(bf));
> +       regs_map(&sample->user_regs, attr->sample_regs_user, arch, bf, size);
>
>         pydict_set_item_string_decref(dict, "uregs",
>                         _PyUnicode_FromString(bf));
> --
> 2.31.1.windows.1
>