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| author | Ben Hutchings <ben@decadent.org.uk> | 2018-11-11 21:45:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-09 19:38:42 +0300 |
| commit | d124dd5c6acefd149f8c555675853d8cd08136a6 (patch) | |
| tree | 0ad1a484b5adc131cf8af6c5c6c1bfd5ba019a50 /tools | |
| parent | 307dbd383650210ce97be436d0d517cbda782c65 (diff) | |
| download | linux-d124dd5c6acefd149f8c555675853d8cd08136a6.tar.xz | |
perf pmu: Suppress potential format-truncation warning
commit 11a64a05dc649815670b1be9fe63d205cb076401 upstream.
Depending on which functions are inlined in util/pmu.c, the snprintf()
calls in perf_pmu__parse_{scale,unit,per_pkg,snapshot}() might trigger a
warning:
util/pmu.c: In function 'pmu_aliases':
util/pmu.c:178:31: error: '%s' directive output may be truncated writing up to 255 bytes into a region of size between 0 and 4095 [-Werror=format-truncation=]
snprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
^~
I found this when trying to build perf from Linux 3.16 with gcc 8.
However I can reproduce the problem in mainline if I force
__perf_pmu__new_alias() to be inlined.
Suppress this by using scnprintf() as has been done elsewhere in perf.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20181111184524.fux4taownc6ndbx6@decadent.org.uk
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/pmu.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 7e49baad304d..7348eea0248f 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -145,7 +145,7 @@ static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char * int fd, ret = -1; char path[PATH_MAX]; - snprintf(path, PATH_MAX, "%s/%s.scale", dir, name); + scnprintf(path, PATH_MAX, "%s/%s.scale", dir, name); fd = open(path, O_RDONLY); if (fd == -1) @@ -175,7 +175,7 @@ static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *n ssize_t sret; int fd; - snprintf(path, PATH_MAX, "%s/%s.unit", dir, name); + scnprintf(path, PATH_MAX, "%s/%s.unit", dir, name); fd = open(path, O_RDONLY); if (fd == -1) @@ -205,7 +205,7 @@ perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name) char path[PATH_MAX]; int fd; - snprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name); + scnprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name); fd = open(path, O_RDONLY); if (fd == -1) @@ -223,7 +223,7 @@ static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias, char path[PATH_MAX]; int fd; - snprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name); + scnprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name); fd = open(path, O_RDONLY); if (fd == -1) |