[Xen-devel] [PATCH 7/9] xen/xenbus: Check before dereferencing it.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

. we do the check whether 'xdev' is NULL - but after we have
dereferenced it.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 drivers/xen/xenbus/xenbus_probe_backend.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/xenbus/xenbus_probe_backend.c 
b/drivers/xen/xenbus/xenbus_probe_backend.c
index 60adf91..331589a 100644
--- a/drivers/xen/xenbus/xenbus_probe_backend.c
+++ b/drivers/xen/xenbus/xenbus_probe_backend.c
@@ -103,10 +103,11 @@ static int xenbus_uevent_backend(struct device *dev,
                return -ENODEV;
 
        xdev = to_xenbus_device(dev);
-       bus = container_of(xdev->dev.bus, struct xen_bus_type, bus);
        if (xdev == NULL)
                return -ENODEV;
 
+       bus = container_of(xdev->dev.bus, struct xen_bus_type, bus);
+
        if (add_uevent_var(env, "MODALIAS=xen-backend:%s", xdev->devicetype))
                return -ENOMEM;
 
-- 
1.7.4.1


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