Messages in this thread | | | Subject | Re: [PATCH v2 3/4] perf intel-pt: Smatch: Fix potential NULL pointer dereference | From | Adrian Hunter <> | Date | Tue, 9 Jul 2019 14:37:14 +0300 |
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On 9/07/19 12:59 AM, Arnaldo Carvalho de Melo wrote: > Em Mon, Jul 08, 2019 at 10:39:36PM +0800, Leo Yan escreveu: >> Based on the following report from Smatch, fix the potential >> NULL pointer dereference check. > > Adrian, are you ok now with these two for pt and bts? Can I have your > acked-by?
Yes they are good. For both:
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
> > - Arnaldo > >> tools/perf/util/intel-pt.c:3200 >> intel_pt_process_auxtrace_info() error: we previously assumed >> 'session->itrace_synth_opts' could be null (see line 3196) >> >> tools/perf/util/intel-pt.c:3206 >> intel_pt_process_auxtrace_info() warn: variable dereferenced before >> check 'session->itrace_synth_opts' (see line 3200) >> >> tools/perf/util/intel-pt.c >> 3196 if (session->itrace_synth_opts && session->itrace_synth_opts->set) { >> 3197 pt->synth_opts = *session->itrace_synth_opts; >> 3198 } else { >> 3199 itrace_synth_opts__set_default(&pt->synth_opts, >> 3200 session->itrace_synth_opts->default_no_sample); >> ^^^^^^^^^^^^^^^^^^^^^^^^^^ >> 3201 if (!session->itrace_synth_opts->default_no_sample && >> 3202 !session->itrace_synth_opts->inject) { >> 3203 pt->synth_opts.branches = false; >> 3204 pt->synth_opts.callchain = true; >> 3205 } >> 3206 if (session->itrace_synth_opts) >> ^^^^^^^^^^^^^^^^^^^^^^^^^^ >> 3207 pt->synth_opts.thread_stack = >> 3208 session->itrace_synth_opts->thread_stack; >> 3209 } >> >> 'session->itrace_synth_opts' is impossible to be a NULL pointer in >> intel_pt_process_auxtrace_info(), thus this patch removes the NULL >> test for 'session->itrace_synth_opts'. >> >> Signed-off-by: Leo Yan <leo.yan@linaro.org> >> --- >> tools/perf/util/intel-pt.c | 13 +++++-------- >> 1 file changed, 5 insertions(+), 8 deletions(-) >> >> diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c >> index c76a96f777fb..df061599fef4 100644 >> --- a/tools/perf/util/intel-pt.c >> +++ b/tools/perf/util/intel-pt.c >> @@ -3210,7 +3210,7 @@ int intel_pt_process_auxtrace_info(union perf_event *event, >> goto err_delete_thread; >> } >> >> - if (session->itrace_synth_opts && session->itrace_synth_opts->set) { >> + if (session->itrace_synth_opts->set) { >> pt->synth_opts = *session->itrace_synth_opts; >> } else { >> itrace_synth_opts__set_default(&pt->synth_opts, >> @@ -3220,8 +3220,7 @@ int intel_pt_process_auxtrace_info(union perf_event *event, >> pt->synth_opts.branches = false; >> pt->synth_opts.callchain = true; >> } >> - if (session->itrace_synth_opts) >> - pt->synth_opts.thread_stack = >> + pt->synth_opts.thread_stack = >> session->itrace_synth_opts->thread_stack; >> } >> >> @@ -3241,11 +3240,9 @@ int intel_pt_process_auxtrace_info(union perf_event *event, >> pt->cbr2khz = tsc_freq / pt->max_non_turbo_ratio / 1000; >> } >> >> - if (session->itrace_synth_opts) { >> - err = intel_pt_setup_time_ranges(pt, session->itrace_synth_opts); >> - if (err) >> - goto err_delete_thread; >> - } >> + err = intel_pt_setup_time_ranges(pt, session->itrace_synth_opts); >> + if (err) >> + goto err_delete_thread; >> >> if (pt->synth_opts.calls) >> pt->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC | >> -- >> 2.17.1 >
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