Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  batman-adv: tp_meter: directly shut down timer on cleanup  batadv_tp_sender_cleanup() was calling timer_delete_sync() followed by timer_delete() to guard against the timer handler re-arming itself between the two calls. This double-deletion hack relied on the sending status being set to 0 to suppress re-arming.  Replace both calls with a single timer_shutdown_sync(). This function both waits for any running timer callback to complete (like timer_delete_sync()) and permanently disarms the timer so it cannot be re-armed afterwards, making re-arming prevention unconditional and self-documenting.  The re-arming property is also required because otherwise:  1. context 0 (batadv_tp_recv_ack()) checks in    batadv_tp_reset_sender_timer() if sending is still 1 -> it is 2. context 1 changes in batadv_tp_sender_shutdown() sending to 0 and in    this process forces the kthread to stop timer in    batadv_tp_sender_cleanup() 3. context 0 continues in batadv_tp_reset_sender_timer() and rearms the    timer -> but the reference for it is already gone