Hi Arnaldo,
Could you please share your comments on this one?
Thanks,
Song
> On Oct 3, 2021, at 10:32 PM, Song Liu <songliubraving@xxxxxx> wrote:
>
> When perf.data is not written cleanly, we would like to process existing
> data as much as possible (please see f_header.data.size == 0 condition
> in perf_session__read_header). However, perf.data with partial data may
> crash perf. Specifically, we see crash in perf-script for NULL
> session->header.env.arch.
>
> Fix this by checking session->header.env.arch before using it to determine
> native_arch. Also split the if condition so it is easier to read.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Song Liu <songliubraving@xxxxxx>
> ---
> tools/perf/builtin-script.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 6211d0b84b7a6..7821f6740ac1d 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -4039,12 +4039,17 @@ int cmd_script(int argc, const char **argv)
> goto out_delete;
>
> uname(&uts);
> - if (data.is_pipe || /* assume pipe_mode indicates native_arch */
> - !strcmp(uts.machine, session->header.env.arch) ||
> - (!strcmp(uts.machine, "x86_64") &&
> - !strcmp(session->header.env.arch, "i386")))
> + if (data.is_pipe) /* assume pipe_mode indicates native_arch */
> native_arch = true;
>
> + if (session->header.env.arch) {
> + if (!strcmp(uts.machine, session->header.env.arch))
> + native_arch = true;
> + else if (!strcmp(uts.machine, "x86_64") &&
> + !strcmp(session->header.env.arch, "i386"))
> + native_arch = true;
> + }
> +
> script.session = session;
> script__setup_sample_type(&script);
>
> --
> 2.30.2
>
