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.hun...@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....@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
>
