Re: [PATCH] i40iw: Receive netdev events post INET_NOTIFIER state

[Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>]

On Fri, Mar 17, 2017 at 06:30:07PM -0500, Shiraz Saleem wrote:
> Netdev notification events are de-registered only when all
> client iwdev instances are removed. If a single client is closed
> and re-opened, netdev events could arrive even before the Control
> Queue-Pair (CQP) is created, causing a NULL pointer dereference crash
> in i40iw_get_cqp_request. Fix this by allowing netdev event
> notification only after we have reached the INET_NOTIFIER state with
> respect to device initialization.
> 
> Reported-by: Stefan Assmann <sassmann-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> Signed-off-by: Shiraz Saleem <shiraz.saleem-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> ---
>  drivers/infiniband/hw/i40iw/i40iw_utils.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/infiniband/hw/i40iw/i40iw_utils.c b/drivers/infiniband/hw/i40iw/i40iw_utils.c
> index d5f5de2..23df3ab 100644
> --- a/drivers/infiniband/hw/i40iw/i40iw_utils.c
> +++ b/drivers/infiniband/hw/i40iw/i40iw_utils.c
> @@ -159,6 +159,9 @@ int i40iw_inetaddr_event(struct notifier_block *notifier,
>  		return NOTIFY_DONE;
>  
>  	iwdev = &hdl->device;
> +	if (iwdev->init_state < INET_NOTIFIER)
> +		return NOTIFY_DONE;
> +
>  	netdev = iwdev->ldev->netdev;
>  	upper_dev = netdev_master_upper_dev_get(netdev);
>  	if (netdev != event_netdev)
> @@ -231,6 +234,9 @@ int i40iw_inet6addr_event(struct notifier_block *notifier,
>  		return NOTIFY_DONE;
>  
>  	iwdev = &hdl->device;
> +	if (iwdev->init_state < INET_NOTIFIER)
> +		return NOTIFY_DONE;
> +
>  	netdev = iwdev->ldev->netdev;
>  	if (netdev != event_netdev)
>  		return NOTIFY_DONE;
> @@ -280,6 +286,8 @@ int i40iw_net_event(struct notifier_block *notifier, unsigned long event, void *
>  		if (!iwhdl)
>  			return NOTIFY_DONE;
>  		iwdev = &iwhdl->device;
> +		if (iwdev->init_state < INET_NOTIFIER)
> +			return NOTIFY_DONE;
>  		p = (__be32 *)neigh->primary_key;
>  		i40iw_copy_ip_ntohl(local_ipaddr, p);
>  		if (neigh->nud_state & NUD_VALID) {
> -- 
> 2.8.3

Reviewed-by: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>

> 
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