linux-kernel - [PATCH] IB/qib: Use kcalloc instead of kzalloc to allocate array

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Message-ID: <1322600880.1534.306.camel@localhost.localdomain>
Date:	Tue, 29 Nov 2011 22:08:00 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] IB/qib: 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/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c
--- a/drivers/infiniband/hw/qib/qib_init.c 2011-11-13 11:07:26.730159415 +0100
+++ b/drivers/infiniband/hw/qib/qib_init.c 2011-11-28 19:51:23.644920442 +0100
@@ -116,7 +116,7 @@ int qib_create_ctxts(struct qib_devdata
 	 * Allocate full ctxtcnt array, rather than just cfgctxts, because
 	 * cleanup iterates across all possible ctxts.
 	 */
-	dd->rcd = kzalloc(sizeof(*dd->rcd) * dd->ctxtcnt, GFP_KERNEL);
+	dd->rcd = kcalloc(dd->ctxtcnt, sizeof(*dd->rcd), GFP_KERNEL);
 	if (!dd->rcd) {
 		qib_dev_err(dd, "Unable to allocate ctxtdata array, "
 			    "failing\n");
@@ -1435,9 +1435,8 @@ int qib_setup_eagerbufs(struct qib_ctxtd
 	egrperchunk = rcd->rcvegrbufs_perchunk;
 	size = rcd->rcvegrbuf_size;
 	if (!rcd->rcvegrbuf) {
-		rcd->rcvegrbuf =
-			kzalloc(chunk * sizeof(rcd->rcvegrbuf[0]),
-				GFP_KERNEL);
+		rcd->rcvegrbuf = kcalloc(chunk, sizeof(rcd->rcvegrbuf[0]),
+					 GFP_KERNEL);
 		if (!rcd->rcvegrbuf)
 			goto bail;
 	}
--
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