linux-kernel - [Patch] Driver core: Fix error handling in bus_add

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Message-ID: <20080218170425.56d03e37@gondolin.boeblingen.de.ibm.com>
Date:	Mon, 18 Feb 2008 17:04:25 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: [Patch] Driver core: Fix error handling in bus_add_driver().

- If the allocation of ->priv fails, the reference on the bus
  must be dropped.
- If adding the kobject fails, kobject_put must be called to
  clean things up.

Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>

---
 drivers/base/bus.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

--- linux-2.6.orig/drivers/base/bus.c
+++ linux-2.6/drivers/base/bus.c
@@ -658,9 +658,10 @@ int bus_add_driver(struct device_driver 
 	pr_debug("bus: '%s': add driver %s\n", bus->name, drv->name);
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
+	if (!priv) {
+		error = -ENOMEM;
+		goto out_put_bus;
+	}
 	klist_init(&priv->klist_devices, NULL, NULL);
 	priv->driver = drv;
 	drv->p = priv;
@@ -668,7 +669,7 @@ int bus_add_driver(struct device_driver 
 	error = kobject_init_and_add(&priv->kobj, &driver_ktype, NULL,
 				     "%s", drv->name);
 	if (error)
-		goto out_put_bus;
+		goto out_unregister;
 
 	if (drv->bus->p->drivers_autoprobe) {
 		error = driver_attach(drv);
--
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