Re: [Xen-devel] [Patch v2 1/4] common/sysctl: Don't leak status in SYSCTL_page_offline_op

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 07/01/14 11:59, Andrew Cooper wrote:
> In addition, 'copyback' should be cleared even in the error case.
>
> Also fix the indentation of the arguments to copy_to_guest() to help clarify
> that the 'ret = -EFAULT' is not part of the condition.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> CC: Keir Fraser <keir@xxxxxxx>
> CC: Jan Beulich <JBeulich@xxxxxxxx>

Ping?

>
> ---
>
> Changes in v2:
>  * Still clear copyback even in the error case.
> ---
>  xen/common/sysctl.c |    7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/xen/common/sysctl.c b/xen/common/sysctl.c
> index 117e095..0cb6ee1 100644
> --- a/xen/common/sysctl.c
> +++ b/xen/common/sysctl.c
> @@ -230,12 +230,9 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) 
> u_sysctl)
>          }
>  
>          if ( copy_to_guest(
> -            op->u.page_offline.status, status,
> -            op->u.page_offline.end - op->u.page_offline.start + 1) )
> -        {
> +                 op->u.page_offline.status, status,
> +                 op->u.page_offline.end - op->u.page_offline.start + 1) )
>              ret = -EFAULT;
> -            break;
> -        }
>  
>          xfree(status);
>          copyback = 0;


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