[PATCH] makedumpfile: fix off-by-one bug in page_to_pfn()

[Atsushi Kumagai]

Hi Wen,

Thank you for the patch. 
I will check it.

Thanks
Kumagai


On Wed, 23 Nov 2011 13:53:51 +0800
Wen Congyang <wency at cn.fujitsu.com> wrote:

> The pfn region in a mmd is [mmd->pfn_start, mmd->pfn_end).
> So the max index should be mmd->pfn_end - mmd->pfn_start -1.
> If index >=(not >) mmd->pfn_end - mmd->pfn_start, we should check
> the next mmd.
> 
> Signed-off-by: Wen Congyang <wency at cn.fujitsu.com>
> 
> ---
>  makedumpfile.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/makedumpfile.c b/makedumpfile.c
> index 7b7c266..db8e53f 100644
> --- a/makedumpfile.c
> +++ b/makedumpfile.c
> @@ -2879,7 +2879,7 @@ page_to_pfn(unsigned long page)
>  		if (page < mmd->mem_map)
>  			continue;
>  		index = (page - mmd->mem_map) / SIZE(page);
> -		if (index > mmd->pfn_end - mmd->pfn_start)
> +		if (index >= mmd->pfn_end - mmd->pfn_start)
>  			continue;
>  		pfn = mmd->pfn_start + index;
>  		break;
> -- 
> 1.7.1