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In cxacru_unbind(), cancel_delayed_work_sync() was conditionally skipped when poll_state was CXPOLL_STOPPED. However, a work item previously scheduled when poll_state was CXPOLL_POLLING may still be pending in the workqueue at the time poll_state transitions to CXPOLL_STOPPED. Skipping cancel_delayed_work_sync() in this case allows the work to fire after cxacru_data is freed, causing a use-after-free when cxacru_poll_status() attempts to acquire instance->poll_state_serialize. Fix this by always calling cancel_delayed_work_sync() regardless of poll_state, ensuring no pending or in-flight work can access the freed instance. Cc: stable+noautosel@kernel.org # untested fix to a driver init path race Reported-by: syzbot+24eb38c789655fc43663@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=24eb38c789655fc43663 Signed-off-by: Nguyen Quang Le Kien <khiemtranzo532001@gmail.com> Link: https://patch.msgid.link/20260803101716.2592486-1-khiemtranzo532001@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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