[PATCH] TouchListenerAcceptReject: Warn and return early on bad listener index

[Bryce Harrington]

Reviewed-by: Bryce Harrington <bryce at canonical.com>

On Fri, Apr 20, 2012 at 11:08:15AM -0700, Chase Douglas wrote:
> Signed-off-by: Chase Douglas <chase.douglas at canonical.com>
> ---
>  dix/touch.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/dix/touch.c b/dix/touch.c
> index dd16367..401cb98 100644
> --- a/dix/touch.c
> +++ b/dix/touch.c
> @@ -966,6 +966,11 @@ TouchListenerAcceptReject(DeviceIntPtr dev, TouchPointInfoPtr ti, int listener,
>      int nev;
>      int i;
>  
> +    BUG_WARN(listener < 0);
> +    BUG_WARN(listener >= ti->num_listeners);
> +    if (listener < 0 || listener >= ti->num_listeners)
> +        return BadMatch;
> +
>      if (listener > 0) {
>          if (mode == XIRejectTouch)
>              TouchRejected(dev, ti, ti->listeners[listener].listener, NULL);
> -- 
> 1.7.9.1