linux-kernel - [PATCH] bnx2x: Use kcalloc instead of kzalloc to allocate array

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Message-ID: <1322600880.1534.320.camel@localhost.localdomain>
Date:	Tue, 29 Nov 2011 22:08:00 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] bnx2x: 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/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c 2011-11-13 11:07:33.983607086 +0100
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c 2011-11-28 19:52:50.979887113 +0100
@@ -3278,14 +3278,14 @@ int __devinit bnx2x_alloc_mem_bp(struct
 	msix_table_size = bp->igu_sb_cnt + 1;
 
 	/* fp array: RSS plus CNIC related L2 queues */
-	fp = kzalloc((BNX2X_MAX_RSS_COUNT(bp) + NON_ETH_CONTEXT_USE) *
+	fp = kcalloc(BNX2X_MAX_RSS_COUNT(bp) + NON_ETH_CONTEXT_USE,
 		     sizeof(*fp), GFP_KERNEL);
 	if (!fp)
 		goto alloc_err;
 	bp->fp = fp;
 
 	/* msix table */
-	tbl = kzalloc(msix_table_size * sizeof(*tbl), GFP_KERNEL);
+	tbl = kcalloc(msix_table_size, sizeof(*tbl), GFP_KERNEL);
 	if (!tbl)
 		goto alloc_err;
 	bp->msix_table = tbl;
diff -u -p a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c 2011-11-28 19:36:47.716773832 +0100
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c 2011-11-28 19:52:53.063259517 +0100
@@ -3342,7 +3342,7 @@ static inline int bnx2x_mcast_refresh_re
 		if (!list_empty(&o->registry.exact_match.macs))
 			return 0;
 
-		elem = kzalloc(sizeof(*elem)*len, GFP_ATOMIC);
+		elem = kcalloc(len, sizeof(*elem), GFP_ATOMIC);
 		if (!elem) {
 			BNX2X_ERR("Failed to allocate registry memory\n");
 			return -ENOMEM;
--
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