linux-kernel - [PATCH 2/3] drivers/bluetooth: Add kmalloc NULL tests

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Date:	Thu, 6 Aug 2009 22:05:18 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Marcel Holtmann <marcel@...tmann.org>,
	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 2/3] drivers/bluetooth: Add kmalloc NULL tests

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

Check that the result of kmalloc is not NULL before dereferencing it.
The patch also replaces kmalloc + memset by kzalloc.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression *x;
identifier f;
constant char *C;
@@

x = \(kmalloc\|kcalloc\|kzalloc\)(...);
... when != x == NULL
    when != x != NULL
    when != (x || ...)
(
kfree(x)
|
f(...,C,...,x,...)
|
*f(...,x,...)
|
*x->f
)
// </smpl>

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

---
 drivers/bluetooth/btmrvl_sdio.c     |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/bluetooth/btmrvl_sdio.c b/drivers/bluetooth/btmrvl_sdio.c
index 1cfa8b4..5b33b85 100644
--- a/drivers/bluetooth/btmrvl_sdio.c
+++ b/drivers/bluetooth/btmrvl_sdio.c
@@ -777,10 +777,11 @@ static int btmrvl_sdio_host_to_card(struct btmrvl_private *priv,
 	buf = payload;
 	if ((unsigned long) payload & (BTSDIO_DMA_ALIGN - 1)) {
 		tmpbufsz = ALIGN_SZ(nb, BTSDIO_DMA_ALIGN);
-		tmpbuf = kmalloc(tmpbufsz, GFP_KERNEL);
-		memset(tmpbuf, 0, tmpbufsz);
+		tmpbuf = kzalloc(tmpbufsz, GFP_KERNEL);
+		if (!tmpbuf)
+			return -ENOMEM;
 		buf = (u8 *) ALIGN_ADDR(tmpbuf, BTSDIO_DMA_ALIGN);
 		memcpy(buf, payload, nb);
 	}
--
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