Re: [PATCH net v2] net: rose: fix UAF bug caused by rose_t0timer_expiry

[Jakub Kicinski]

On Tue,  5 Jul 2022 20:56:10 +0800 Duoming Zhou wrote:
> +	del_timer_sync(&rose_neigh->t0timer);

/**
 * del_timer_sync - deactivate a timer and wait for the handler to finish.
[...]
 * Synchronization rules: Callers must prevent restarting of the timer,
 * otherwise this function is meaningless.

how is the restarting prevented? If I'm looking right 
rose_t0timer_expiry() rearms the timer.