Re: [Xen-devel] [PATCH v3 1/2] amd/passthrough: Do not leak domain mappings from do_invalidate_dte()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.12.13 at 18:59, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> Coverity ID: 1135379
> 
> As the code stands, the domain mapping will be leaked on each error path.
> 
> The mapping can be for a much shorter period of time, and all the relevent
> information can be pulled out at once.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> CC: Keir Fraser <keir@xxxxxxx>
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>

Suravee?

> ---
> 
> Changes in v3:
>  * Dont break the pointer arithmatic on gdte
> ---
>  xen/drivers/passthrough/amd/iommu_guest.c |    9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/xen/drivers/passthrough/amd/iommu_guest.c 
> b/xen/drivers/passthrough/amd/iommu_guest.c
> index 952600a..c1fa0ff 100644
> --- a/xen/drivers/passthrough/amd/iommu_guest.c
> +++ b/xen/drivers/passthrough/amd/iommu_guest.c
> @@ -430,6 +430,10 @@ static int do_invalidate_dte(struct domain *d, 
> cmd_entry_t *cmd)
>  
>      gdom_id  = get_domid_from_dte(gdte);
>      gcr3_gfn = get_guest_cr3_from_dte(gdte);
> +    glx      = get_glx_from_dte(gdte);
> +    gv       = get_gv_from_dte(gdte);
> +
> +    unmap_domain_page(gdte);
>  
>      /* Do not update host dte before gcr3 has been set */
>      if ( gcr3_gfn == 0 )
> @@ -449,11 +453,6 @@ static int do_invalidate_dte(struct domain *d, 
> cmd_entry_t *cmd)
>          return -ENODEV;
>      }
>  
> -    glx = get_glx_from_dte(gdte);
> -    gv = get_gv_from_dte(gdte);
> -
> -    unmap_domain_page(dte_base);
> -
>      /* Setup host device entry */
>      hdom_id = host_domid(d, gdom_id);
>      req_id = get_dma_requestor_id(iommu->seg, mbdf);
> -- 
> 1.7.10.4




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