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io_uring: fix poll error reporting 

We should not return an error code in req->result in
io_poll_check_events(), because it may get mangled and returned as
success. Just return the error code directly, the callers will fail the
request or proceed accordingly.

Fixes: 6bf9c47a39 ("io_uring: defer file assignment")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/5f03514ee33324dc811fb93df84aee0f695fb044.1649862516.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-04-13 16:10:35 +01:00 committed by Jens Axboe
parent cce64ef013
commit 7179c3ce3d
1 changed files with 2 additions and 3 deletions
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3
fs/io_uring.c
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@ -5861,8 +5861,7 @@ static int io_poll_check_events(struct io_kiocb *req, bool locked)
unsigned flags = locked ? 0 : IO_URING_F_UNLOCKED;
if (unlikely(!io_assign_file(req, flags)))
req->result = -EBADF;
else
return -EBADF;
req->result = vfs_poll(req->file, &pt) & req->apoll_events;
}