Re: [PATCH 2/3] scsi: megaraid_sas: check user-provided offsets

[James Bottomley]

On Sun, 2021-01-03 at 17:26 +0100, Arnd Bergmann wrote:
[...]
> @@ -8209,7 +8208,7 @@ megasas_mgmt_fw_ioctl(struct megasas_instance
> *instance,
>                 if (instance->consistent_mask_64bit)
>                         put_unaligned_le64(sense_handle, sense_ptr);
>                 else
> -                       put_unaligned_le32(sense_handle, sense_ptr);
> +                       put_unaligned_le64(sense_handle, sense_ptr);
>         }

This hunk can't be right.  It effectively means removing the if.
However, the if is needed because sense_handle is a dma_addr_t which
can be either 32 or 64 bit.  What about changing the if to 

if (sizeof(dma_addr_t) == 8)

instead?

James