linux-kernel - [PATCH] perf/x86: Use kmalloc_array() in merge

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Date:   Sun, 4 Sep 2016 11:00:15 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     x86@...nel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH] perf/x86: Use kmalloc_array() in merge_attr()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sun, 4 Sep 2016 10:45:20 +0200

* A multiplication for the size determination of a memory allocation
  indicated that an array data structure should be processed.
  Thus use the corresponding function "kmalloc_array".

  This issue was detected by using the Coccinelle software.

* Replace the specification of a data structure by a pointer dereference
  to make the corresponding size determination a bit safer according to
  the Linux coding style convention.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 arch/x86/events/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 18a1acf..f7f3578 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1618,7 +1618,7 @@ __init struct attribute **merge_attr(struct attribute **a, struct attribute **b)
 		j++;
 	j++;
 
-	new = kmalloc(sizeof(struct attribute *) * j, GFP_KERNEL);
+	new = kmalloc_array(j, sizeof(*new), GFP_KERNEL);
 	if (!new)
 		return NULL;
 
-- 
2.9.3