linux-kernel - Re: [PATCH 4/5] drivers/usb : Correct the size argument to kzalloc

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Message-ID: <Pine.LNX.4.64.0912301534070.23134@ask.diku.dk>
Date:	Wed, 30 Dec 2009 15:34:37 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	gregkh@...e.de, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 4/5] drivers/usb : Correct the size argument to kzalloc

From: Julia Lawall <julia@...u.dk>

urb_priv->tds has type struct td **, not struct td *, so the
elements of the array should have pointer type, not structure type.

Convert kzalloc to kcalloc as well.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@disable sizeof_type_expr@
type T;
T **x;
@@

  x =
  <+...sizeof(
- T
+ *x
  )...+>
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/usb/host/fhci-hcd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/usb/host/fhci-hcd.c b/drivers/usb/host/fhci-hcd.c
--- a/drivers/usb/host/fhci-hcd.c
+++ b/drivers/usb/host/fhci-hcd.c
@@ -432,7 +432,7 @@ static int fhci_urb_enqueue(struct usb_h
 		return -ENOMEM;
 
 	/* allocate the private part of the URB */
-	urb_priv->tds = kzalloc(size * sizeof(struct td), mem_flags);
+	urb_priv->tds = kcalloc(size, sizeof(*urb_priv->tds), mem_flags);
 	if (!urb_priv->tds) {
 		kfree(urb_priv);
 		return -ENOMEM;
--
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