linux-kernel - [PATCH] xen-pciback: fix up cleanup path when alloc fails

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Message-Id: <1448569959-7245-1-git-send-email-cardoe@cardoe.com>
Date:	Thu, 26 Nov 2015 14:32:39 -0600
From:	Doug Goldstein <cardoe@...doe.com>
To:	xen-devel@...ts.xenproject.org
Cc:	linux-kernel@...r.kernel.org, Bob Liu <bob.liu@...cle.com>,
	Paul Durrant <paul.durrant@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jonathan Creekmore <jonathan.creekmore@...il.com>,
	Doug Goldstein <cardoe@...doe.com>
Subject: [PATCH] xen-pciback: fix up cleanup path when alloc fails

When allocating a pciback device fails, avoid the possibility of a
use after free.

Reported-by: Jonathan Creekmore <jonathan.creekmore@...il.com>
Signed-off-by: Doug Goldstein <cardoe@...doe.com>
---
 drivers/xen/xen-pciback/xenbus.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
index 98bc345..4843741 100644
--- a/drivers/xen/xen-pciback/xenbus.c
+++ b/drivers/xen/xen-pciback/xenbus.c
@@ -44,7 +44,6 @@ static struct xen_pcibk_device *alloc_pdev(struct xenbus_device *xdev)
 	dev_dbg(&xdev->dev, "allocated pdev @ 0x%p\n", pdev);
 
 	pdev->xdev = xdev;
-	dev_set_drvdata(&xdev->dev, pdev);
 
 	mutex_init(&pdev->dev_lock);
 
@@ -58,6 +57,9 @@ static struct xen_pcibk_device *alloc_pdev(struct xenbus_device *xdev)
 		kfree(pdev);
 		pdev = NULL;
 	}
+
+	dev_set_drvdata(&xdev->dev, pdev);
+
 out:
 	return pdev;
 }
-- 
2.4.10

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