linux-kernel - [PATCH] perf tests: Do not use sizeof on pointer type

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Message-Id: <1461862017-23358-1-git-send-email-vaishali.thakkar@oracle.com>
Date:	Thu, 28 Apr 2016 22:16:57 +0530
From:	Vaishali Thakkar <vaishali.thakkar@...cle.com>
To:	peterz@...radead.org
Cc:	mingo@...hat.com, acme@...nel.org,
	alexander.shishkin@...ux.intel.com, linux-kernel@...r.kernel.org,
	Vaishali Thakkar <vaishali.thakkar@...cle.com>
Subject: [PATCH] perf tests: Do not use sizeof on pointer type

Using sizeof on a malloced pointer type will return the wordsize
which can often cause one to allocate a buffer much smaller than
it is needed. So, here do not use sizeof on pointer type.

Note that this has no effect on runtime because 'dsos' is a
pointer to a pointer.

Problem found using Coccinelle.

Signed-off-by: Vaishali Thakkar <vaishali.thakkar@...cle.com>
---
 tools/perf/tests/dso-data.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/dso-data.c b/tools/perf/tests/dso-data.c
index dc673ff..8cf0d9e 100644
--- a/tools/perf/tests/dso-data.c
+++ b/tools/perf/tests/dso-data.c
@@ -202,7 +202,7 @@ static int dsos__create(int cnt, int size)
 {
 	int i;
 
-	dsos = malloc(sizeof(dsos) * cnt);
+	dsos = malloc(sizeof(*dsos) * cnt);
 	TEST_ASSERT_VAL("failed to alloc dsos array", dsos);
 
 	for (i = 0; i < cnt; i++) {
-- 
2.1.4