PCI: Be a bit defensive in quirk_nvidia_ck804() so we don't risk dereferencing a...

pci_get_slot() may return NULL if nothing was found.  quirk_nvidia_ck804()
does not check the value returned from pci_get_slot(), so it may end up
causing a NULL pointer deref.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 30c41fc..8a2db01 100644 (file)
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1743,6 +1743,8 @@ static void __devinit quirk_nvidia_ck804_msi_ht_cap(struct pci_dev *dev)
         * a single one having MSI is enough to be sure that MSI are supported.
         */
        pdev = pci_get_slot(dev->bus, 0);
+       if (!pdev)
+               return;
        if (!msi_ht_cap_enabled(dev) && !msi_ht_cap_enabled(pdev)) {
                printk(KERN_WARNING "PCI: MSI quirk detected. "
                       "MSI disabled on chipset %s.\n",