linux-kernel - [PATCH] mm: Use kcalloc instead of kzalloc to allocate array

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Message-ID: <1322600880.1534.349.camel@localhost.localdomain>
Date:	Tue, 29 Nov 2011 22:08:00 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: Use kcalloc instead of kzalloc to allocate array

The advantage of kcalloc is, that will prevent integer overflows which could
result from the multiplication of number of elements and size and it is also
a bit nicer to read.

The semantic patch that makes this change is available
in https://lkml.org/lkml/2011/11/25/107

Signed-off-by: Thomas Meyer <thomas@...3r.de>
---

diff -u -p a/mm/vmalloc.c b/mm/vmalloc.c
--- a/mm/vmalloc.c 2011-11-28 19:36:48.210120310 +0100
+++ b/mm/vmalloc.c 2011-11-28 20:06:49.925235983 +0100
@@ -2348,8 +2348,8 @@ struct vm_struct **pcpu_get_vm_areas(con
 		return NULL;
 	}
 
-	vms = kzalloc(sizeof(vms[0]) * nr_vms, GFP_KERNEL);
-	vas = kzalloc(sizeof(vas[0]) * nr_vms, GFP_KERNEL);
+	vms = kcalloc(nr_vms, sizeof(vms[0]), GFP_KERNEL);
+	vas = kcalloc(nr_vms, sizeof(vas[0]), GFP_KERNEL);
 	if (!vas || !vms)
 		goto err_free;
 
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