linux-kernel - Re: [PATCH] crash with /proc/iomem on sparc64

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Date:	Tue, 17 Mar 2009 08:08:08 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	David Miller <davem@...emloft.net>
cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crash with /proc/iomem on sparc64



On Tue, 17 Mar 2009, Mikulas Patocka wrote:

> Hi
> 
> When you compile kernel on Sparc64 with heap memory checking and type
> "cat /proc/iomem", you get a crash, because pointers in struct resource 
> are uninitialized.
> 
> Most code fills struct resource with zeros, so I assume that it is 
> responsibility of the caller of request_resource to initialized it, not 
> the responsibility of request_resource functuion.
> 
> After 2.6.29 is out, there could be a check for uninitialized fields added 
> to request_resource to avoid crashes like this.
> 
> Mikulas

I forgot to add:

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>

> ---
>  arch/sparc/kernel/pci_common.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6.29-rc8-devel/arch/sparc/kernel/pci_common.c
> ===================================================================
> --- linux-2.6.29-rc8-devel.orig/arch/sparc/kernel/pci_common.c	2009-03-17 12:49:51.000000000 +0100
> +++ linux-2.6.29-rc8-devel/arch/sparc/kernel/pci_common.c	2009-03-17 12:50:16.000000000 +0100
> @@ -368,7 +368,7 @@ static void pci_register_iommu_region(st
>  	const u32 *vdma = of_get_property(pbm->op->node, "virtual-dma", NULL);
>  
>  	if (vdma) {
> -		struct resource *rp = kmalloc(sizeof(*rp), GFP_KERNEL);
> +		struct resource *rp = kzalloc(sizeof(*rp), GFP_KERNEL);
>  
>  		if (!rp) {
>  			prom_printf("Cannot allocate IOMMU resource.\n");
> 
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