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io_uring/io-wq: only free worker if it was allocated for creation
commite6db6f9398
upstream. We have two types of task_work based creation, one is using an existing worker to setup a new one (eg when going to sleep and we have no free workers), and the other is allocating a new worker. Only the latter should be freed when we cancel task_work creation for a new worker. Fixes:af82425c6a
("io_uring/io-wq: free worker if task_work creation is canceled") Reported-by: syzbot+d56ec896af3637bdb7e4@syzkaller.appspotmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 6 additions and 1 deletions
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@ -1217,7 +1217,12 @@ static void io_wq_cancel_tw_create(struct io_wq *wq)
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worker = container_of(cb, struct io_worker, create_work);
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io_worker_cancel_cb(worker);
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kfree(worker);
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/*
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* Only the worker continuation helper has worker allocated and
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* hence needs freeing.
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*/
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if (cb->func == create_worker_cont)
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kfree(worker);
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}
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}
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