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io_uring: drop 'ctx' ref on task work cancelation

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If task_work ends up being marked for cancelation, we go through a
cancelation helper instead of the queue path. In converting task_work to
always hold a ctx reference, this path was missed. Make sure that
io_req_task_cancel() puts the reference that is being held against the
ctx.

Fixes: 6d816e088c ("io_uring: hold 'ctx' reference around task_work queue + execute")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-09-14 08:20:12 -06:00
parent 202700e18a
commit 87ceb6a6b8
1 changed files with 2 additions and 0 deletions
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2
fs/io_uring.c
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@ -1787,8 +1787,10 @@ static void __io_req_task_cancel(struct io_kiocb *req, int error)
static void io_req_task_cancel(struct callback_head *cb)
{
struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
struct io_ring_ctx *ctx = req->ctx;
__io_req_task_cancel(req, -ECANCELED);
percpu_ref_put(&ctx->refs);
}
static void __io_req_task_submit(struct io_kiocb *req)