Re: [Xen-devel] [PATCH net-next] xen-netback: correct length checks on hash copy_ops

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, May 18, 2016 at 08:53:01AM +0100, Paul Durrant wrote:
> The length checks on the grant table copy_ops for setting hash key and
> hash mapping are checking the local 'len' value which is correct in
> the case of the former but not the latter. This was picked up by
> static analysis checks.
> 
> This patch replaces checks of 'len' with 'copy_op.len' in both cases
> to correct the incorrect check, keep the two checks consistent, and to
> make it clear what the checks are for.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Cc: Wei Liu <wei.liu2@xxxxxxxxxx>

Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>

> ---
>  drivers/net/xen-netback/hash.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/xen-netback/hash.c b/drivers/net/xen-netback/hash.c
> index 392e392..fb87cb3 100644
> --- a/drivers/net/xen-netback/hash.c
> +++ b/drivers/net/xen-netback/hash.c
> @@ -311,7 +311,7 @@ u32 xenvif_set_hash_key(struct xenvif *vif, u32 gref, u32 
> len)
>       if (len > XEN_NETBK_MAX_HASH_KEY_SIZE)
>               return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
>  
> -     if (len != 0) {
> +     if (copy_op.len != 0) {
>               gnttab_batch_copy(&copy_op, 1);
>  
>               if (copy_op.status != GNTST_okay)
> @@ -359,7 +359,7 @@ u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, 
> u32 len,
>               if (mapping[off++] >= vif->num_queues)
>                       return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
>  
> -     if (len != 0) {
> +     if (copy_op.len != 0) {
>               gnttab_batch_copy(&copy_op, 1);
>  
>               if (copy_op.status != GNTST_okay)
> -- 
> 2.1.4
> 

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