linux-kernel - [PATCH] usb: gadget: storage: Use kcalloc instead of kzalloc to allocate array

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Message-ID: <1322600880.1534.336.camel@localhost.localdomain>
Date:	Tue, 29 Nov 2011 22:08:00 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	balbi@...com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] usb: gadget: storage: 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/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
--- a/drivers/usb/gadget/f_fs.c 2011-11-13 11:07:51.550550667 +0100
+++ b/drivers/usb/gadget/f_fs.c 2011-11-28 20:05:17.011277814 +0100
@@ -1408,7 +1408,7 @@ static int ffs_epfiles_create(struct ffs
 	ENTER();
 
 	count = ffs->eps_count;
-	epfiles = kzalloc(count * sizeof *epfiles, GFP_KERNEL);
+	epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL);
 	if (!epfiles)
 		return -ENOMEM;
 
diff -u -p a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
--- a/drivers/usb/gadget/f_mass_storage.c 2011-11-28 19:36:48.006781560 +0100
+++ b/drivers/usb/gadget/f_mass_storage.c 2011-11-28 20:05:29.388010153 +0100
@@ -2763,7 +2763,7 @@ static struct fsg_common *fsg_common_ini
 	 * Create the LUNs, open their backing files, and register the
 	 * LUN devices in sysfs.
 	 */
-	curlun = kzalloc(nluns * sizeof *curlun, GFP_KERNEL);
+	curlun = kcalloc(nluns, sizeof(*curlun), GFP_KERNEL);
 	if (unlikely(!curlun)) {
 		rc = -ENOMEM;
 		goto error_release;
--
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