Duoming Zhou 2568a7e083 mISDN: fix use-after-free bugs in l1oip timer handlers ... The l1oip_cleanup() traverses the l1oip_ilist and calls release_card() to cleanup module and stack. However, release_card() calls del_timer() to delete the timers such as keep_tl and timeout_tl. If the timer handler is running, the del_timer() will not stop it and result in UAF bugs. One of the processes is shown below: (cleanup routine) | (timer handler) release_card() | l1oip_timeout() ... | del_timer() | ... ... | kfree(hc) //FREE | | hc->timeout_on = 0 //USE Fix by calling del_timer_sync() in release_card(), which makes sure the timer handlers have finished before the resources, such as l1oip and so on, have been deallocated. What's more, the hc->workq and hc->socket_thread can kick those timers right back in. We add a bool flag to show if card is released. Then, check this flag in hc->workq and hc->socket_thread. Fixes: 3712b42d4b ("Add layer1 over IP support") Signed-off-by: Duoming Zhou <duoming@zju.edu.cn> Reviewed-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2022-09-30 12:32:42 +01:00
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clock.c
core.c	mISDN: change function names to avoid conflicts	2021-12-28 12:12:04 +00:00
core.h	mISDN: change function names to avoid conflicts	2021-12-28 12:12:04 +00:00
dsp.h
dsp_audio.c
dsp_biquad.h
dsp_blowfish.c
dsp_cmx.c
dsp_core.c	mISDN: Use LIST_HEAD() for list_head	2021-03-30 13:34:42 -07:00
dsp_dtmf.c
dsp_ecdis.h
dsp_hwec.c
dsp_hwec.h
dsp_pipeline.c	mISDN: Fix memory leak in dsp_pipeline_build()	2022-03-05 12:04:14 +00:00
dsp_tones.c
fsm.c
fsm.h
hwchannel.c
Kconfig	misdn: dsp: select CONFIG_BITREVERSE	2021-01-05 15:50:36 -08:00
l1oip.h	mISDN: fix use-after-free bugs in l1oip timer handlers	2022-09-30 12:32:42 +01:00
l1oip_codec.c
l1oip_core.c	mISDN: fix use-after-free bugs in l1oip timer handlers	2022-09-30 12:32:42 +01:00
layer1.c	mISDN: change function names to avoid conflicts	2021-12-28 12:12:04 +00:00
layer1.h
layer2.c
layer2.h
Makefile
socket.c	net: remove noblock parameter from skb_recv_datagram()	2022-04-06 13:45:26 +01:00
stack.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
tei.c
timerdev.c