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Message-ID: <20080321200154.GN17292@ldl.fc.hp.com>
Date: Fri, 21 Mar 2008 14:01:54 -0600
From: Alex Chiang <achiang@...com>
To: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Cc: Greg KH <gregkh@...e.de>, Gary Hade <garyhade@...ibm.com>,
Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
Matthew Wilcox <matthew@....cx>, warthog19@...lescrag.net,
rick.jones2@...com, linux-kernel@...r.kernel.org,
linux-pci@...ey.karlin.mff.cuni.cz, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 8/16][BUG] PCI slot: Fix invalid memory access (Not for
mainline!)
* Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>:
> Fix kernel oops in pci_release_slot() when dbg() is enabled.
Merged, thanks.
/ac
>
> The dbg() in pci_release_slot() cause a kernel oops (invalid memory
> access) because it accesses slot after it is released. We need to
> access slot before calling kobject_put().
>
> Signed-off-by: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
>
> ---
> drivers/pci/slot.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> Index: linux-2.6.25-rc6/drivers/pci/slot.c
> ===================================================================
> --- linux-2.6.25-rc6.orig/drivers/pci/slot.c
> +++ linux-2.6.25-rc6/drivers/pci/slot.c
> @@ -191,13 +191,14 @@ EXPORT_SYMBOL_GPL(pci_create_slot);
>
> int pci_destroy_slot(struct pci_slot *slot)
> {
> + dbg("%s: decreased refcount to %d on %x:%d\n", __func__,
> + atomic_read(&slot->kobj.kref.refcount) - 1, slot->bus->number,
> + slot->number);
> +
> down_write(&pci_bus_sem);
> kobject_put(&slot->kobj);
> up_write(&pci_bus_sem);
>
> - dbg("%s: decreased refcount to %d on %x:%d\n", __func__,
> - atomic_read(&slot->kobj.kref.refcount), slot->bus->number,
> - slot->number);
> return 0;
> }
> EXPORT_SYMBOL_GPL(pci_destroy_slot);
>
>
--
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