• Jiri Slaby's avatar
    PCI: hotplug/cpqphp, fix NULL dereference · a7ef7d1f
    Jiri Slaby authored
    
    
    There are devices out there which are PCI Hot-plug controllers with
    compaq PCI IDs, but are not bridges, hence have pdev->subordinate
    NULL. But cpqphp expects the pointer to be non-NULL.
    
    Add a check to the probe function to avoid oopses like:
    BUG: unable to handle kernel NULL pointer dereference at 00000050
    IP: [<f82e3c41>] cpqhpc_probe+0x951/0x1120 [cpqphp]
    *pdpt = 0000000033779001 *pde = 0000000000000000
    ...
    
    The device here was:
    00:0b.0 PCI Hot-plug controller [0804]: Compaq Computer Corporation PCI Hotplug Controller [0e11:a0f7] (rev 11)
    	Subsystem: Compaq Computer Corporation Device [0e11:a2f8]
    Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
    Cc: Greg KH <greg@kroah.com>
    Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
    a7ef7d1f