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io_uring/io-wq: only free worker if it was allocated for creation

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commit e6db6f9398 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>
This commit is contained in:
Jens Axboe 2023-01-08 10:39:17 -07:00 • committed by Justin Hammond
parent c99fc6b287
commit 97453d8dcf
1 changed files with 6 additions and 1 deletions
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7
io_uring/io-wq.c
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@ -1217,7 +1217,12 @@ static void io_wq_cancel_tw_create(struct io_wq *wq)
worker = container_of(cb, struct io_worker, create_work);
io_worker_cancel_cb(worker);
kfree(worker);
/*
* Only the worker continuation helper has worker allocated and
* hence needs freeing.
*/
if (cb->func == create_worker_cont)
kfree(worker);
}
}