Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once

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hci_cmd_sync_dequeue_once() does lookup and then cancel
the entry under two separate lock sections. Meanwhile,
hci_cmd_sync_work() can also delete the same entry,
leading to double list_del() and "UAF".

Fix this by holding cmd_sync_work_lock across both
lookup and cancel, so that the entry cannot be removed
concurrently.

Fixes: 505ea2b295 ("Bluetooth: hci_sync: Add helper functions to manipulate cmd_sync queue")
Reported-by: Cen Zhang <zzzccc427@163.com>
Signed-off-by: Cen Zhang <zzzccc427@163.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

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Cen Zhang 2025-09-29 05:30:17 +00:00 • committed by Luiz Augusto von Dentz

parent 1ab6658174

commit 09b0cd1297

1 changed files with 9 additions and 3 deletions

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net/bluetooth/hci_sync.c

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