linux-kernel - Re: [PATCH 1/1] PCI: xen-pcifront, fix PCI reference leak

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Message-Id: <xenfront-reffix-fixreq@mdm.bga.com>
Date:	Thu, 04 Nov 2010 12:27:07 -0600
From:	Milton Miller <miltonm@....com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	jirislaby@...il.com, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 1/1] PCI: xen-pcifront, fix PCI reference leak

On 2010-11-04 at about 14:31:30 Jiri Slaby wrote:
> Stanse found that when pdev is found and has no driver a reference is
> leaked in pcifront_common_process. So add pci_dev_put there. For the
> pdev == NULL case, pci_dev_put(NULL) is fine.

While that may be true, the dev_err(&pcidev->dev ... is a NULL pointer
deref.

> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
> ---
>  drivers/pci/xen-pcifront.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
> index a87c498..f9ffc05 100644
> --- a/drivers/pci/xen-pcifront.c
> +++ b/drivers/pci/xen-pcifront.c
> @@ -578,6 +578,7 @@  static pci_ers_result_t pcifront_common_process(int cmd,
>  	if (!pcidev || !pcidev->driver) {
>  		dev_err(&pcidev->dev,
>  			"device or driver is NULL\n");
> +		pci_dev_put(pcidev);
>  		return result;
>  	}
>  	pdrv = pcidev->driver;
> 

milton
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