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io_uring/net: fix accept multishot handling

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Commit f6a89bf5278d6e15016a736db67043560d1b50d5 upstream.

REQ_F_APOLL_MULTISHOT doesn't guarantee it's executed from the multishot
context, so a multishot accept may get executed inline, fail
io_req_post_cqe(), and ask the core code to kill the request with
-ECANCELED by returning IOU_STOP_MULTISHOT even when a socket has been
accepted and installed.

Cc: stable@vger.kernel.org
Fixes: 390ed29b5e ("io_uring: add IORING_ACCEPT_MULTISHOT for accept")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/51c6deb01feaa78b08565ca8f24843c017f5bc80.1740331076.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov
2025-02-23 17:22:29 +00:00
committed by Greg Kroah-Hartman
parent 3184297d6f
commit 7e2449ee66
1 changed files with 2 additions and 0 deletions
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2
io_uring/net.c
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@@ -1438,6 +1438,8 @@ retry:
goto retry;
io_req_set_res(req, ret, 0);
if (!(issue_flags & IO_URING_F_MULTISHOT))
return IOU_OK;
return IOU_STOP_MULTISHOT;
}