[PATCH] drm: radeon: fix overflow on 32bit systems

[Christian König]

Am 27.11.18 um 12:50 schrieb Yang Xiao:
> From: Young Xiao <YangX92 at hotmail.com>
>
> the type mem->start is unsigned long, so this can overflow on
> 32bit system, since the type addr is uint64_t.
>
> Signed-off-by: Young Xiao <YangX92 at hotmail.com>

Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/radeon/radeon_vm.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
> index 7f1a9c7..51559d8 100644
> --- a/drivers/gpu/drm/radeon/radeon_vm.c
> +++ b/drivers/gpu/drm/radeon/radeon_vm.c
> @@ -946,7 +946,7 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
>   		bo_va->flags &= ~RADEON_VM_PAGE_WRITEABLE;
>   
>   	if (mem) {
> -		addr = mem->start << PAGE_SHIFT;
> +		addr = (u64)mem->start << PAGE_SHIFT;
>   		if (mem->mem_type != TTM_PL_SYSTEM) {
>   			bo_va->flags |= RADEON_VM_PAGE_VALID;
>   		}