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Fix kernel NULL pointer dereference in xen-blkfront
When booting Xen Dom0 on a pre-release 3.2.1 hypervisor the system Oopses on a "Unable to handle kernel NULL pointer dereference" in xenwatch. From the backtrace it looks like backend_changed is calling bdget_disk with a NULL pointer. Checking for NULL and returning ENODEV instead allows the kernel to boot.
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@ -977,6 +977,8 @@ static void backend_changed(struct xenbus_device *dev,
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break;
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case XenbusStateClosing:
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if (info->gd == NULL)
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xenbus_dev_fatal(dev, -ENODEV, "gd is NULL");
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bd = bdget_disk(info->gd, 0);
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if (bd == NULL)
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xenbus_dev_fatal(dev, -ENODEV, "bdget failed");
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