On 2020/6/4 15:37, Herbert Xu wrote:
> The function hisi_acc_create_sg_pool may allocate a block of
> memory of size PAGE_SIZE * 2^(MAX_ORDER - 1). This value may
> exceed 2^31 on ia64, which would overflow the u32.
>
> This patch caps it at 2^31.
>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Fixes: d8ac7b85236b ("crypto: hisilicon - fix large sgl memory...")
> Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Fine to me, Thanks!
>
> diff --git a/drivers/crypto/hisilicon/sgl.c b/drivers/crypto/hisilicon/sgl.c
> index 0e8c7e324fb4..725a739800b0 100644
> --- a/drivers/crypto/hisilicon/sgl.c
> +++ b/drivers/crypto/hisilicon/sgl.c
> @@ -66,7 +66,8 @@ struct hisi_acc_sgl_pool *hisi_acc_create_sgl_pool(struct device *dev,
>
> sgl_size = sizeof(struct acc_hw_sge) * sge_nr +
> sizeof(struct hisi_acc_hw_sgl);
> - block_size = PAGE_SIZE * (1 << (MAX_ORDER - 1));
> + block_size = 1 << (PAGE_SHIFT + MAX_ORDER <= 32 ?
> + PAGE_SHIFT + MAX_ORDER - 1 : 31);
> sgl_num_per_block = block_size / sgl_size;
> block_num = count / sgl_num_per_block;
> remain_sgl = count % sgl_num_per_block;
>
