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

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Message-ID: <1322865373.1534.357.camel@localhost.localdomain>
Date:	Fri, 02 Dec 2011 23:36:13 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] sfc: 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/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c
--- a/drivers/net/ethernet/sfc/rx.c 2011-11-13 11:07:36.306977044 +0100
+++ b/drivers/net/ethernet/sfc/rx.c 2011-11-28 19:53:10.346917167 +0100
@@ -669,7 +669,7 @@ int efx_probe_rx_queue(struct efx_rx_que
 		  rx_queue->ptr_mask);
 
 	/* Allocate RX buffers */
-	rx_queue->buffer = kzalloc(entries * sizeof(*rx_queue->buffer),
+	rx_queue->buffer = kcalloc(entries, sizeof(*rx_queue->buffer),
 				   GFP_KERNEL);
 	if (!rx_queue->buffer)
 		return -ENOMEM;
diff -u -p a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c
--- a/drivers/net/ethernet/sfc/selftest.c 2011-11-13 11:07:36.306977044 +0100
+++ b/drivers/net/ethernet/sfc/selftest.c 2011-11-28 19:53:09.640237232 +0100
@@ -503,8 +503,8 @@ efx_test_loopback(struct efx_tx_queue *t
 		/* Determine how many packets to send */
 		state->packet_count = efx->txq_entries / 3;
 		state->packet_count = min(1 << (i << 2), state->packet_count);
-		state->skbs = kzalloc(sizeof(state->skbs[0]) *
-				      state->packet_count, GFP_KERNEL);
+		state->skbs = kcalloc(state->packet_count,
+				      sizeof(state->skbs[0]), GFP_KERNEL);
 		if (!state->skbs)
 			return -ENOMEM;
 		state->flush = false;
diff -u -p a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
--- a/drivers/net/ethernet/sfc/tx.c 2011-11-13 11:07:36.313643816 +0100
+++ b/drivers/net/ethernet/sfc/tx.c 2011-11-28 19:53:08.056874176 +0100
@@ -468,7 +468,7 @@ int efx_probe_tx_queue(struct efx_tx_que
 		  tx_queue->queue, efx->txq_entries, tx_queue->ptr_mask);
 
 	/* Allocate software ring */
-	tx_queue->buffer = kzalloc(entries * sizeof(*tx_queue->buffer),
+	tx_queue->buffer = kcalloc(entries, sizeof(*tx_queue->buffer),
 				   GFP_KERNEL);
 	if (!tx_queue->buffer)
 		return -ENOMEM;


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