diff options
| author | Andrzej Hajda <a.hajda@samsung.com> | 2015-10-06 12:00:17 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-10-07 00:04:59 +0300 |
| commit | 38349665388fb079fb2bc8c46db9446dd976802a (patch) | |
| tree | 5b212fd3e5984d2faff65bf79bebc61f97f787c8 /tools/perf/util/event.c | |
| parent | 1178bfd41f3ab6914eb6884875b776bc3032c9b5 (diff) | |
| download | linux-38349665388fb079fb2bc8c46db9446dd976802a.tar.xz | |
perf tools: Fix handling read result using a signed variable
The function can return negative value, assigning it to unsigned
variable can cause memory corruption.
The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].
[1]: http://permalink.gmane.org/gmane.linux.kernel/2038576
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: kernel-janitors@vger.kernel.org
Link: http://lkml.kernel.org/r/1444122017-16856-1-git-send-email-a.hajda@samsung.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/event.c')
| -rw-r--r-- | tools/perf/util/event.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c index cb98b5af9e17..8b10621b415c 100644 --- a/tools/perf/util/event.c +++ b/tools/perf/util/event.c @@ -67,7 +67,8 @@ static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len, char filename[PATH_MAX]; char bf[4096]; int fd; - size_t size = 0, n; + size_t size = 0; + ssize_t n; char *nl, *name, *tgids, *ppids; *tgid = -1; |