linux-kernel - Re: [PATCH] x86: pci/xen, fix memory leak

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Date:	Mon, 8 Nov 2010 10:34:04 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	jirislaby@...il.com, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH] x86: pci/xen, fix memory leak

On Sat, Nov 06, 2010 at 10:06:49AM +0100, Jiri Slaby wrote:
> Stanse found that xen_setup_msi_irqs leaks memory when
> xen_allocate_pirq fails. Free the memory in that fail path.

Duh! Yes, sticking it in the queue for bug-fixes. Thank you
for finding it.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: xen-devel@...ts.xensource.com
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: x86@...nel.org
> ---
>  arch/x86/pci/xen.c |    8 +++++---
>  1 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
> index 117f5b8..d7b5109 100644
> --- a/arch/x86/pci/xen.c
> +++ b/arch/x86/pci/xen.c
> @@ -147,8 +147,10 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
>  		irq = xen_allocate_pirq(v[i], 0, /* not sharable */
>  			(type == PCI_CAP_ID_MSIX) ?
>  			"pcifront-msi-x" : "pcifront-msi");
> -		if (irq < 0)
> -			return -1;
> +		if (irq < 0) {
> +			ret = -1;
> +			goto free;
> +		}
>  
>  		ret = set_irq_msi(irq, msidesc);
>  		if (ret)
> @@ -164,7 +166,7 @@ error:
>  	if (ret == -ENODEV)
>  		dev_err(&dev->dev, "Xen PCI frontend has not registered" \
>  			" MSI/MSI-X support!\n");
> -
> +free:
>  	kfree(v);
>  	return ret;
>  }
> -- 
> 1.7.3.1
> 
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