linux-kernel - Re: [PATCH] nvme-pci: Fix NULL ptr deref in EEH code

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Date:   Tue, 20 Mar 2018 08:22:55 +0100
From:   Christoph Hellwig <hch@....de>
To:     Michael Neuling <mikey@...ling.org>
Cc:     Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH] nvme-pci: Fix NULL ptr deref in EEH code

On Tue, Mar 20, 2018 at 11:22:42AM +1100, Michael Neuling wrote:
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index b6f43b738f..404b346e3c 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -2626,6 +2626,9 @@ static pci_ers_result_t nvme_error_detected(struct pci_dev *pdev,
>  {
>  	struct nvme_dev *dev = pci_get_drvdata(pdev);
>  
> +	if (!dev)
> +		return PCI_ERS_RESULT_NEED_RESET;

This implies the method has been called before ->probe has been finished
or after ->remove has been called.  That would be fundamentally racy
and needs to be fixed in the PCI layer, not papered over in drivers.