linux-kernel - Re: Fix misplaced kfree from xlated_setup_gnttab

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Date:	Fri, 24 Jan 2014 13:48:57 -0500
From:	Dave Jones <davej@...hat.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
	xen-devel@...ts.xensource.com
Subject: Re: Fix misplaced kfree from xlated_setup_gnttab_pages

On Fri, Jan 24, 2014 at 01:46:55PM -0500, Konrad Rzeszutek Wilk wrote:
 > Actually it should also be freed on the success path, as so:
 > 
 > I can squash it in, if you are OK with that?
 
Looks good to me.

thanks,

	Dave

 > diff --git a/arch/x86/xen/grant-table.c b/arch/x86/xen/grant-table.c
 > index 103c93f..c985835 100644
 > --- a/arch/x86/xen/grant-table.c
 > +++ b/arch/x86/xen/grant-table.c
 > @@ -162,14 +162,15 @@ static int __init xlated_setup_gnttab_pages(void)
 >  	rc = arch_gnttab_map_shared(pfns, nr_grant_frames, nr_grant_frames,
 >  				    &xen_auto_xlat_grant_frames.vaddr);
 >  
 > -	kfree(pages);
 >  	if (rc) {
 >  		pr_warn("%s Couldn't map %ld pfns rc:%d\n", __func__,
 >  			nr_grant_frames, rc);
 >  		free_xenballooned_pages(nr_grant_frames, pages);
 > +		kfree(pages);
 >  		kfree(pfns);
 >  		return rc;
 >  	}
 > +	kfree(pages);
 >  
 >  	xen_auto_xlat_grant_frames.pfn = pfns;
 >  	xen_auto_xlat_grant_frames.count = nr_grant_frames;

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