linux-kernel - Re: [PATCH] PCI: rcar-gen2: Fix crash in resource_list_first

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Date:   Tue, 4 Aug 2020 09:13:48 -0600
From:   Rob Herring <robh@...nel.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        PCI <linux-pci@...r.kernel.org>,
        "open list:MEDIA DRIVERS FOR RENESAS - FCP" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: rcar-gen2: Fix crash in resource_list_first_type()

On Tue, Aug 4, 2020 at 6:04 AM Geert Uytterhoeven
<geert+renesas@...der.be> wrote:
>
> The conversion to modern host bridge probing made the driver allocate
> its private data using devm_pci_alloc_host_bridge(), but forgot to
> remove the old allocation.  Hence part of the driver initialization is
> done using the new instance, while another part is done using the old
> instance, leading to a crash due to uninitialized bridge DMA ranges:
>
>     Unable to handle kernel NULL pointer dereference at virtual address 00000008
>     pgd = (ptrval)
>     [00000008] *pgd=00000000
>     Internal error: Oops: 5 [#1] SMP ARM
>     CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.8.0-rc1-shmobile-00035-g92d69cc6275845a7 #645
>     Hardware name: Generic R-Car Gen2 (Flattened Device Tree)
>     PC is at rcar_pci_probe+0x154/0x340
>     LR is at _raw_spin_unlock_irqrestore+0x18/0x20
>
> Fix this by dropping the old allocation.
>
> Fixes: 92d69cc6275845a7 ("PCI: rcar-gen2: Convert to use modern host bridge probe functions")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
>  drivers/pci/controller/pci-rcar-gen2.c | 4 ----
>  1 file changed, 4 deletions(-)

Acked-by: Rob Herring <robh@...nel.org>