6.18-stable review patch. If anyone has any objections, please let me know.
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From: Michal Suchanek msuchanek@suse.de
[ Upstream commit 2fee899c068c159e486e62623afe9e2a4975bd79 ]
The line_len is only set on success. Check the return value instead.
util/hwmon_pmu.c: In function ‘perf_pmus__read_hwmon_pmus’: util/hwmon_pmu.c:742:20: warning: ‘line_len’ may be used uninitialized [-Wmaybe-uninitialized] 742 | if (line_len > 0 && line[line_len - 1] == '\n') | ^ util/hwmon_pmu.c:719:24: note: ‘line_len’ was declared here 719 | size_t line_len;
Fixes: 53cc0b351ec9 ("perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs") Signed-off-by: Michal Suchanek msuchanek@suse.de Signed-off-by: Namhyung Kim namhyung@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/hwmon_pmu.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/tools/perf/util/hwmon_pmu.c b/tools/perf/util/hwmon_pmu.c index 416dfea9ffff6..5c27256a220a5 100644 --- a/tools/perf/util/hwmon_pmu.c +++ b/tools/perf/util/hwmon_pmu.c @@ -742,8 +742,7 @@ int perf_pmus__read_hwmon_pmus(struct list_head *pmus) continue; } io__init(&io, name_fd, buf2, sizeof(buf2)); - io__getline(&io, &line, &line_len); - if (line_len > 0 && line[line_len - 1] == '\n') + if (io__getline(&io, &line, &line_len) > 0 && line[line_len - 1] == '\n') line[line_len - 1] = '\0'; hwmon_pmu__new(pmus, buf, class_hwmon_ent->d_name, line); close(name_fd);