From: Arnaldo Carvalho de Melo acme@redhat.com
[ Upstream commit fdbdd7e8580eac9bdafa532746c865644d125e34 ]
In which case it simply returns "unknown", like when it can't figure out the evsel->name value.
This makes this code more robust and fixes a problem in 'perf trace' where a NULL evsel was being passed to a routine that only used the evsel for printing its name when a invalid syscall id was passed.
Reported-by: Leo Yan leo.yan@linaro.org Cc: Adrian Hunter adrian.hunter@intel.com Cc: Jiri Olsa jolsa@kernel.org Cc: Namhyung Kim namhyung@kernel.org Link: https://lkml.kernel.org/n/tip-f30ztaasku3z935cn3ak3h53@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/evsel.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 0cf6f537f980..3ab81e8e079e 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -587,6 +587,9 @@ const char *perf_evsel__name(struct perf_evsel *evsel) { char bf[128];
+ if (!evsel) + goto out_unknown; + if (evsel->name) return evsel->name;
@@ -623,7 +626,10 @@ const char *perf_evsel__name(struct perf_evsel *evsel)
evsel->name = strdup(bf);
- return evsel->name ?: "unknown"; + if (evsel->name) + return evsel->name; +out_unknown: + return "unknown"; }
const char *perf_evsel__group_name(struct perf_evsel *evsel)