linux-kernel - [PATCH 2/5] drivers/block: Correct NULL test

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Date:	Sun, 27 Dec 2009 22:27:11 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	drbd-dev@...ts.linbit.com, drbd-user@...ts.linbit.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 2/5] drivers/block: Correct NULL test

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

Test the just-allocated value for NULL rather than some other value.

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

// <smpl>
@@
expression x,y;
statement S;
@@

x = \(kmalloc\|kcalloc\|kzalloc\)(...);
(
if ((x) == NULL) S
|
if (
-   y
+   x
       == NULL)
 S
)
// </smpl>

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

---
 drivers/block/drbd/drbd_receiver.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -3944,7 +3944,7 @@ static int drbd_do_auth(struct drbd_conf
 	}
 
 	right_response = kmalloc(resp_size, GFP_NOIO);
-	if (response == NULL) {
+	if (right_response == NULL) {
 		dev_err(DEV, "kmalloc of right_response failed\n");
 		rv = 0;
 		goto fail;
--
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