linux-kernel - [PATCH] xen/xenbus: handle potential dangling pointer issue in xen_pcibk_xenbus

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Message-Id: <20240529122232.25360-1-yskelg@gmail.com>
Date: Wed, 29 May 2024 21:22:33 +0900
From: yskelg@...il.com
To: Stefano Stabellini <sstabellini@...nel.org>,
	Juergen Gross <jgross@...e.com>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Cc: skhan@...uxfoundation.org,
	sj@...nel.org,
	Austin Kim <austindh.kim@...il.com>,
	shjy180909@...il.com,
	linux-kernel@...r.kernel.org,
	xen-devel@...ts.xenproject.org,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	Yunseong Kim <yskelg@...il.com>
Subject: [PATCH] xen/xenbus: handle potential dangling pointer issue in xen_pcibk_xenbus_probe

From: Yunseong Kim <yskelg@...il.com>

If 'xen_pcibk_init_devices()' fails. This ensures that 'pdev->xdev' does
not point to 'xdev' when 'pdev' is freed.

Signed-off-by: Yunseong Kim <yskelg@...il.com>
---
 drivers/xen/xen-pciback/xenbus.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
index b11e401f1b1e..348d6803b8c0 100644
--- a/drivers/xen/xen-pciback/xenbus.c
+++ b/drivers/xen/xen-pciback/xenbus.c
@@ -54,6 +54,7 @@ static struct xen_pcibk_device *alloc_pdev(struct xenbus_device *xdev)
 	INIT_WORK(&pdev->op_work, xen_pcibk_do_op);
 
 	if (xen_pcibk_init_devices(pdev)) {
+		pdev->xdev = NULL;
 		kfree(pdev);
 		pdev = NULL;
 	}
-- 
2.34.1