diff options
Diffstat (limited to 'tools/perf/util/pmu.c')
| -rw-r--r-- | tools/perf/util/pmu.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index a7f05e4dda97..7683c6749d66 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -1756,17 +1756,19 @@ int perf_pmu__event_source_devices_fd(void) * then pathname will be filled with * "/sys/bus/event_source/devices/cs_etm/format" * - * Return 0 if the sysfs mountpoint couldn't be found or if no - * characters were written. + * Return 0 if the sysfs mountpoint couldn't be found, if no characters were + * written or if the buffer size is exceeded. */ int perf_pmu__pathname_scnprintf(char *buf, size_t size, const char *pmu_name, const char *filename) { - char base_path[PATH_MAX]; + size_t len; - if (!perf_pmu__event_source_devices_scnprintf(base_path, sizeof(base_path))) + len = perf_pmu__event_source_devices_scnprintf(buf, size); + if (!len || (len + strlen(pmu_name) + strlen(filename) + 1) >= size) return 0; - return scnprintf(buf, size, "%s%s/%s", base_path, pmu_name, filename); + + return scnprintf(buf + len, size - len, "%s/%s", pmu_name, filename); } int perf_pmu__pathname_fd(int dirfd, const char *pmu_name, const char *filename, int flags) |