In the Linux kernel, the following vulnerability has been resolved:
bna: prevent IOC timer rearm during teardown
bna: prevent IOC timer rearm during teardown
bnad_pci_remove() and the probe disable_ioceth path call timer_delete_sync() for ioc_timer, sem_timer and hb_timer, but not for iocpf_timer. bnad_iocpf_timeout() then takes bnad->bna_lock after free_netdev() has freed the struct bnad.
Deleting iocpf_timer last does not fix this. sem_timer and iocpf_timer rearm each other: bnad_iocpf_sem_timeout() can arm iocpf_timer, and bnad_iocpf_timeout() arms sem_timer from bfa_ioc_hw_sem_get() when the semaphore is busy. timer_delete_sync() only waits out its own callback. bnad_ioceth_disable() can time out and leave that callback live.
Shut all four IOC timers down with timer_shutdown_sync() on both paths, so a later mod_timer() is ignored.
This issue was identified during our ongoing static-analysis research while reviewing kernel code.
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