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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>
This commit is contained in:
Andrzej Hajda 2015-10-06 11:00:17 +02:00 committed by Arnaldo Carvalho de Melo
parent 1178bfd41f
commit 3834966538
1 changed files with 2 additions and 1 deletions
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3
tools/perf/util/event.c
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@ -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;