From: Krzysztof Halasa <khc@pm.waw.pl>
Date: Wed, 17 Dec 2008 08:24:13 +0000 (-0800)
Subject: net: kernel BUG at drivers/net/phy/mdio_bus.c:165!
X-Git-Tag: v2.6.28-rc9~3^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8e5752dc0a56a01527055b0c37510b1d6b6b861;p=pandora-kernel.git

net: kernel BUG at drivers/net/phy/mdio_bus.c:165!

kernel BUG at drivers/net/phy/mdio_bus.c:165!
Unable to handle kernel NULL pointer dereference at virtual address 00000000

How?

mdiobus_alloc() sets bus->state = MDIOBUS_ALLOCATED.

mdiobus_register() sets bus->state = MDIOBUS_REGISTERED but then can
   fail (mdiobus_scan()) returning an error to the caller.

The caller aborts correctly with mdiobus_free() which does:
        if (bus->state == MDIOBUS_ALLOCATED) {
                kfree(bus);
                return;
        }

        BUG_ON(bus->state != MDIOBUS_UNREGISTERED);

Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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