linux-kernel - Re: [PATCH 7/7] ALPHA: support graphics on non-zero PCI domains

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Message-ID: <461D1BA3.60903@hp.com>
Date:	Wed, 11 Apr 2007 13:32:19 -0400
From:	Jay Estabrook <jay.estabrook@...com>
To:	rth@...ddle.net
Cc:	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jay Estabrook <jay.estabrook@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] ALPHA: support graphics on non-zero PCI domains

Richard Henderson wrote:
> On Wed, Apr 11, 2007 at 12:30:48PM +0400, Ivan Kokshaysky wrote:
>   
>> +VGA_MAP_MEM(unsigned long xaddr, unsigned int size)
>> +{
>> +	/* Create a new VGA ioport resource WRT the hose it is on. */
>> +	if (pci_vga_hose && pci_vga_hose->index) {
>> +		static struct resource alpha_vga =
>> +		  { .name = "alpha-vga+", .start = 0x3C0, .end = 0x3DF };
>> +		struct resource new_vga = alpha_vga;
>> +
>> +		new_vga.start += pci_vga_hose->io_space->start;
>> +		new_vga.end   += pci_vga_hose->io_space->start;
>> +		request_resource(&ioport_resource, &new_vga);
>>     
>
> This leaks the local stack frame variable new_vga into the
> resource tree, does it not?  Shouldn't you be kmallocing this?
>
>
> r~
>   
Yes, it does leak, and yes, it should be kmalloced. Something like this?

        struct resource *new_vga;

        new_vga = kmalloc(sizeof(struct resource), GFP_ATOMIC);
        if (new_vga) {
            *new_vga = alpha_vga;
            new_vga->start += pci_vga_hose->io_space->start;
            new_vga->end   += pci_vga_hose->io_space->start;
            request_resource(&ioport_resource, new_vga);
        }

Thanks, Richard, I'll regenerate this one...

--Jay++

-- 
Jay A Estabrook                            HPTC - XC I & B
Hewlett-Packard Company - ZKO1-3/D-B.8     (603) 884-0301
110 Spit Brook Road, Nashua NH 03062       Jay.Estabrook@...com

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