Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()

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l2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer
and id_addr_timer while holding conn->lock. However, the work functions
l2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire
conn->lock, creating a potential AB-BA deadlock if the work is already
executing when l2cap_conn_del() takes the lock.

Move the work cancellations before acquiring conn->lock and use
disable_delayed_work_sync() to additionally prevent the works from
being rearmed after cancellation, consistent with the pattern used in
hci_conn_del().

Fixes: ab4eedb790 ("Bluetooth: L2CAP: Fix corrupted list in hci_chan_del")
Signed-off-by: Hyunwoo Kim <imv4bel@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

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Hyunwoo Kim 2026-03-20 20:01:26 +09:00 • committed by Luiz Augusto von Dentz

parent 94d8e6fe5d

commit 00fdebbbc5

1 changed files with 3 additions and 5 deletions

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net/bluetooth/l2cap_core.c

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