diff options
| author | Kaige Ye <ye@kaige.org> | 2023-08-04 10:09:08 +0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2023-08-21 10:54:22 -0300 |
| commit | 58a8d2edd57b35307d81ec6c304697707e6067c1 (patch) | |
| tree | bca704cb6ac07d38f03ee4ab6475b77489a02e23 | |
| parent | 7d9642311b6d9d319a6948581244561d2a0890a1 (diff) | |
perf stat-display: Check if snprintf()'s fmt argument is NULL
It is undefined behavior to pass NULL as snprintf()'s fmt argument.
Here is an example to trigger the problem:
$ perf stat --metric-only -x, -e instructions -- sleep 1
insn per cycle,
Segmentation fault (core dumped)
With this patch:
$ perf stat --metric-only -x, -e instructions -- sleep 1
insn per cycle,
,
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Kaige Ye <ye@kaige.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/01CA7674B690CA24+20230804020907.144562-2-ye@kaige.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/util/stat-display.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c index d45d5dcb0e2b..afe6db8e7bf4 100644 --- a/tools/perf/util/stat-display.c +++ b/tools/perf/util/stat-display.c @@ -578,7 +578,7 @@ static void print_metric_only_csv(struct perf_stat_config *config __maybe_unused if (!valid_only_metric(unit)) return; unit = fixunit(tbuf, os->evsel, unit); - snprintf(buf, sizeof buf, fmt, val); + snprintf(buf, sizeof(buf), fmt ?: "", val); ends = vals = skip_spaces(buf); while (isdigit(*ends) || *ends == '.') ends++; @@ -600,7 +600,7 @@ static void print_metric_only_json(struct perf_stat_config *config __maybe_unuse if (!valid_only_metric(unit)) return; unit = fixunit(tbuf, os->evsel, unit); - snprintf(buf, sizeof(buf), fmt, val); + snprintf(buf, sizeof(buf), fmt ?: "", val); ends = vals = skip_spaces(buf); while (isdigit(*ends) || *ends == '.') ends++; |