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Date:	Tue, 06 Oct 2015 11:00:17 +0200
From:	Andrzej Hajda <>
Cc:	Andrzej Hajda <>,
	Bartlomiej Zolnierkiewicz <>,
	Marek Szyprowski <>,
	Peter Zijlstra <>,
	Ingo Molnar <>,
	Arnaldo Carvalho de Melo <>,
Subject: [PATCH] perf tools: fix handling read result

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].


Signed-off-by: Andrzej Hajda <>
 tools/perf/util/event.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index cb98b5a..8b10621 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;

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