On 10/27/2017 12:14 PM, Yisheng Xie wrote:
> We have already checked whether maxnode is a page worth of bits, by:
> maxnode > PAGE_SIZE*BITS_PER_BYTE
>
> So no need to check it once more.
>
> Signed-off-by: Yisheng Xie <xieyisheng1@xxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
> ---
> mm/mempolicy.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> index 613e9d0..3b51bb3 100644
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -1280,8 +1280,6 @@ static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask,
> /* When the user specified more nodes than supported just check
> if the non supported part is all zero. */
> if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) {
> - if (nlongs > PAGE_SIZE/sizeof(long))
> - return -EINVAL;
> for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) {
> unsigned long t;
> if (get_user(t, nmask + k))
>
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