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a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=o5oIOnhZENCTenyL_yNV:22 a=bC-a23v3AAAA:8 a=Q-fNiiVtAAAA:8 a=QyXUC8HyAAAA:8 a=Byx-y9mGAAAA:8 a=VwQbUJbxAAAA:8 a=8Fg3trD0StBx1J9-ZcUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=FO4_E8m0qiDe52t0p3_H:22 a=5yU3S35YU4bGjq-dph-N:22 a=Bho9c0fBagfJEIQBS7DQ:22 cc=ntf awl=host:12312 Hi Sasha and Greg, On 16/06/26 20:24, Greg Kroah-Hartman wrote: > 5.15-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Duoming Zhou > > [ Upstream commit 9cb83d4be0b9b697eae93d321e0da999f9cdfcfc ] > > The brcmf_btcoex_detach() only shuts down the btcoex timer, if the > flag timer_on is false. However, the brcmf_btcoex_timerfunc(), which > runs as timer handler, sets timer_on to false. This creates critical > race conditions: > > 1.If brcmf_btcoex_detach() is called while brcmf_btcoex_timerfunc() > is executing, it may observe timer_on as false and skip the call to > timer_shutdown_sync(). > > 2.The brcmf_btcoex_timerfunc() may then reschedule the brcmf_btcoex_info > worker after the cancel_work_sync() has been executed, resulting in > use-after-free bugs. > > The use-after-free bugs occur in two distinct scenarios, depending on > the timing of when the brcmf_btcoex_info struct is freed relative to > the execution of its worker thread. > > Scenario 1: Freed before the worker is scheduled > > The brcmf_btcoex_info is deallocated before the worker is scheduled. > A race condition can occur when schedule_work(&bt_local->work) is > called after the target memory has been freed. The sequence of events > is detailed below: > > CPU0 | CPU1 > brcmf_btcoex_detach | brcmf_btcoex_timerfunc > | bt_local->timer_on = false; > if (cfg->btcoex->timer_on) | > ... | > cancel_work_sync(); | > ... | > kfree(cfg->btcoex); // FREE | > | schedule_work(&bt_local->work); // USE > > Scenario 2: Freed after the worker is scheduled > > The brcmf_btcoex_info is freed after the worker has been scheduled > but before or during its execution. In this case, statements within > the brcmf_btcoex_handler() — such as the container_of macro and > subsequent dereferences of the brcmf_btcoex_info object will cause > a use-after-free access. The following timeline illustrates this > scenario: > > CPU0 | CPU1 > brcmf_btcoex_detach | brcmf_btcoex_timerfunc > | bt_local->timer_on = false; > if (cfg->btcoex->timer_on) | > ... | > cancel_work_sync(); | > ... | schedule_work(); // Reschedule > | > kfree(cfg->btcoex); // FREE | brcmf_btcoex_handler() // Worker > /* | btci = container_of(....); // USE > The kfree() above could | ... > also occur at any point | btci-> // USE > during the worker's execution| > */ | > > To resolve the race conditions, drop the conditional check and call > timer_shutdown_sync() directly. It can deactivate the timer reliably, > regardless of its current state. Once stopped, the timer_on state is > then set to false. > > Fixes: 61730d4dfffc ("brcmfmac: support critical protocol API for DHCP") > Acked-by: Arend van Spriel > Signed-off-by: Duoming Zhou > Link: https://patch.msgid.link/20250822050839.4413-1-duoming@zju.edu.cn > Signed-off-by: Johannes Berg > Signed-off-by: Robert Garcia > Signed-off-by: Sasha Levin > --- > drivers/net/wireless/broadcom/brcm80211/brcmfmac/btcoex.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/btcoex.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/btcoex.c > index f9f18ff451ea7c..f46e4090021777 100644 > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/btcoex.c > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/btcoex.c > @@ -392,10 +392,8 @@ void brcmf_btcoex_detach(struct brcmf_cfg80211_info *cfg) > if (!cfg->btcoex) > return; > > - if (cfg->btcoex->timer_on) { > - cfg->btcoex->timer_on = false; > - del_timer_sync(&cfg->btcoex->timer); > - } > + del_timer_sync(&cfg->btcoex->timer); > + cfg->btcoex->timer_on = false; > I ran an AI assisted backport review over the 5.15.210 queue. I think this 5.15.y backport doesn;t really try to do the same thing like upstream. Why so ? Upstream 9cb83d4be0b9 uses timer_shutdown_sync() before canceling the work and freeing cfg->btcoex: timer_shutdown_sync(&cfg->btcoex->timer); cfg->btcoex->timer_on = false; cancel_work_sync(&cfg->btcoex->work); The 5.15.y backport still uses del_timer_sync(): del_timer_sync(&cfg->btcoex->timer); cfg->btcoex->timer_on = false; cancel_work_sync(&cfg->btcoex->work); The timer code in this 5.15.y tree already documents that del_timer_sync() cannot guarantee the timer is not rearmed by concurrent code, so the key point is the difference between del_timer_sync() and timer_shutdown_sync(). I think 5.15.y should directly use timer_shutdown_sync(), as we don't have commit: 292a089d78d3 ("treewide: Convert del_timer*() to timer_shutdown*()") in 5.15.y, thoughts ? thanks, Harshit > cancel_work_sync(&cfg->btcoex->work); >