Duoming Zhou 175302f6b7 mISDN: hfcpci: Fix use-after-free bug in hfcpci_softirq ... The function hfcpci_softirq() is a timer handler. If it is running, the timer_pending() will return 0 and the del_timer_sync() in HFC_cleanup() will not be executed. As a result, the use-after-free bug will happen. The process is shown below: (cleanup routine) | (timer handler) HFC_cleanup() | hfcpci_softirq() if (timer_pending(&hfc_tl)) | del_timer_sync() | ... | ... pci_unregister_driver(hc) | driver_unregister | driver_for_each_device bus_remove_driver | _hfcpci_softirq driver_detach | ... put_device(dev) //[1]FREE | | dev_get_drvdata(dev) //[2]USE The device is deallocated is position [1] and used in position [2]. Fix by removing the "timer_pending" check in HFC_cleanup(), which makes sure that the hfcpci_softirq() have finished before the resource is deallocated. Fixes: 009fc857c5 ("mISDN: fix possible use-after-free in HFC_cleanup()") Signed-off-by: Duoming Zhou <duoming@zju.edu.cn> Signed-off-by: David S. Miller <davem@davemloft.net>		2022-10-09 19:11:54 +01:00
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mISDN	mISDN: hfcpci: Fix use-after-free bug in hfcpci_softirq	2022-10-09 19:11:54 +01:00
Makefile	isdn: move capi drivers to staging	2019-05-31 11:17:41 +02:00