linux-kernel - [ 71/91] hvc_xen: NULL dereference on allocation failure

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Message-Id: <20120527002522.367563701@linuxfoundation.org>
Date:	Sun, 27 May 2012 09:26:17 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [ 71/91] hvc_xen: NULL dereference on allocation failure

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 201a52bea928687b7557728b176ac4f8a37d5cbd upstream.

If kzalloc() returns a NULL here, we pass a NULL to
xencons_disconnect_backend() which will cause an Oops.

Also I removed the __GFP_ZERO while I was at it since kzalloc() implies
__GFP_ZERO.

Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/hvc/hvc_xen.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -430,9 +430,9 @@ static int __devinit xencons_probe(struc
 	if (devid == 0)
 		return -ENODEV;
 
-	info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL | __GFP_ZERO);
+	info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
 	if (!info)
-		goto error_nomem;
+		return -ENOMEM;
 	dev_set_drvdata(&dev->dev, info);
 	info->xbdev = dev;
 	info->vtermno = xenbus_devid_to_vtermno(devid);


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