| Message ID | 20190702103420.27540-9-leo.yan@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | perf: Fix errors detected by Smatch | expand |
Em Tue, Jul 02, 2019 at 06:34:17PM +0800, Leo Yan escreveu: > Based on the following report from Smatch, fix the potential > NULL pointer dereference check. > > tools/perf/util/session.c:1252 > dump_read() error: we previously assumed 'evsel' could be null > (see line 1249) > > tools/perf/util/session.c > 1240 static void dump_read(struct perf_evsel *evsel, union perf_event *event) > 1241 { > 1242 struct read_event *read_event = &event->read; > 1243 u64 read_format; > 1244 > 1245 if (!dump_trace) > 1246 return; > 1247 > 1248 printf(": %d %d %s %" PRIu64 "\n", event->read.pid, event->read.tid, > 1249 evsel ? perf_evsel__name(evsel) : "FAIL", > 1250 event->read.value); > 1251 > 1252 read_format = evsel->attr.read_format; > ^^^^^^^ > > 'evsel' could be NULL pointer, for this case this patch directly bails > out without dumping read_event. So this needs another hunk, adding it. diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c index 8e0e06d3edfc..f4591a1438b4 100644 --- a/tools/perf/builtin-inject.c +++ b/tools/perf/builtin-inject.c @@ -224,7 +224,7 @@ static int perf_event__repipe_sample(struct perf_tool *tool, struct perf_evsel *evsel, struct machine *machine) { - if (evsel->handler) { + if (evsel && evsel->handler) { inject_handler f = evsel->handler; return f(tool, event, sample, evsel, machine); } > Signed-off-by: Leo Yan <leo.yan@linaro.org> > --- > tools/perf/util/session.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c > index 54cf163347f7..2e61dd6a3574 100644 > --- a/tools/perf/util/session.c > +++ b/tools/perf/util/session.c > @@ -1249,6 +1249,9 @@ static void dump_read(struct perf_evsel *evsel, union perf_event *event) > evsel ? perf_evsel__name(evsel) : "FAIL", > event->read.value); > > + if (!evsel) > + return; > + > read_format = evsel->attr.read_format; > > if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) > -- > 2.17.1
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 54cf163347f7..2e61dd6a3574 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -1249,6 +1249,9 @@ static void dump_read(struct perf_evsel *evsel, union perf_event *event) evsel ? perf_evsel__name(evsel) : "FAIL", event->read.value); + if (!evsel) + return; + read_format = evsel->attr.read_format; if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
Based on the following report from Smatch, fix the potential NULL pointer dereference check. tools/perf/util/session.c:1252 dump_read() error: we previously assumed 'evsel' could be null (see line 1249) tools/perf/util/session.c 1240 static void dump_read(struct perf_evsel *evsel, union perf_event *event) 1241 { 1242 struct read_event *read_event = &event->read; 1243 u64 read_format; 1244 1245 if (!dump_trace) 1246 return; 1247 1248 printf(": %d %d %s %" PRIu64 "\n", event->read.pid, event->read.tid, 1249 evsel ? perf_evsel__name(evsel) : "FAIL", 1250 event->read.value); 1251 1252 read_format = evsel->attr.read_format; ^^^^^^^ 'evsel' could be NULL pointer, for this case this patch directly bails out without dumping read_event. Signed-off-by: Leo Yan <leo.yan@linaro.org> --- tools/perf/util/session.c | 3 +++ 1 file changed, 3 insertions(+)