On 26/08/14 16:38, Chen Gang wrote:
> In grow_gnttab_list(), 'i' is 'unsigned int', and 'nr_glist_frames' may
> be 0 because 'nr_grant_frames' may be 0. So 'i' may never be less than
> 'nr_glist_frames' in failure processing, which cause infinite looping.
nr_grant_frames is at least 1. See gnttab_init().
> --- a/drivers/xen/grant-table.c
> +++ b/drivers/xen/grant-table.c
> @@ -592,8 +592,8 @@ static int grow_gnttab_list(unsigned int more_frames)
> return 0;
>
> grow_nomem:
> - for ( ; i >= nr_glist_frames; i--)
> - free_page((unsigned long) gnttab_list[i]);
> + while (i > nr_glist_frames)
> + free_page((unsigned long) gnttab_list[--i]);
while (i-- > nr_glist_frames)
...
Would have been better.
David
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