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On Sat, Sep 18, 2010 at 05:18:46PM +0300, Julian Anastasov wrote:
>
> Change the usage of svc usecnt during command execution:
>
> - we check if svc is registered but we do not need to hold usecnt
> reference while under __ip_vs_mutex, only the packet handling needs
> it during scheduling
>
> - change __ip_vs_service_get to __ip_vs_service_find and
> __ip_vs_svc_fwm_get to __ip_vs_svc_fwm_find because now caller
> will increase svc->usecnt
>
> - put common code that calls update_service in __ip_vs_update_dest
>
> - put common code in ip_vs_unlink_service() and use it to unregister
> the service
>
> - add comment that svc should not be accessed after ip_vs_del_service
> anymore
>
> - all IP_VS_WAIT_WHILE calls are now unified: usecnt > 0
>
> - Properly log the app ports
>
> As result, some problems are fixed:
>
> - possible use-after-free of svc in ip_vs_genl_set_cmd after
> ip_vs_del_service because our usecnt reference does not guarantee that
> svc is not freed on refcnt==0, eg. when no dests are moved to trash
>
> - possible usecnt leak in do_ip_vs_set_ctl after ip_vs_del_service
> when the service is not freed now, for example, when some
> destionations are moved into trash and svc->refcnt remains above 0.
> It is harmless because svc is not in hash anymore.
>
> Signed-off-by: Julian Anastasov <ja@xxxxxx>
Hi Julian,
thats a pretty big patch to review, but it looks good to me.
Acked-by: Simon Horman <horms@xxxxxxxxxxxx>
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