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io_uring/net: avoid sending -ECONNABORTED on repeated connection requests 

commit 74e2e17ee1 upstream.

Since io_uring does nonblocking connect requests, if we do two repeated
ones without having a listener, the second will get -ECONNABORTED rather
than the expected -ECONNREFUSED. Treat -ECONNABORTED like a normal retry
condition if we're nonblocking, if we haven't already seen it.

Cc: stable@vger.kernel.org
Fixes: 3fb1bd6881 ("io_uring/net: handle -EINPROGRESS correct for IORING_OP_CONNECT")
Link: https://github.com/axboe/liburing/issues/828
Reported-by: Hui, Chunyang <sanqian.hcy@antgroup.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 2023-03-20 11:13:49 -06:00 committed by Greg Kroah-Hartman
parent 4481ce2bfa
commit 7bc203584e
1 changed files with 17 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
io_uring/net.c
View File

@ -47,6 +47,7 @@ struct io_connect {
struct sockaddr __user *addr;
int addr_len;
bool in_progress;
bool seen_econnaborted;
};
struct io_sr_msg {
@ -1431,7 +1432,7 @@ int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
conn->addr_len = READ_ONCE(sqe->addr2);
conn->in_progress = false;
conn->in_progress = conn->seen_econnaborted = false;
return 0;
}
@ -1468,18 +1469,24 @@ int io_connect(struct io_kiocb *req, unsigned int issue_flags)
ret = __sys_connect_file(req->file, &io->address,
connect->addr_len, file_flags);
if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) {
if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED)
&& force_nonblock) {
if (ret == -EINPROGRESS) {
connect->in_progress = true;
} else {
if (req_has_async_data(req))
return -EAGAIN;
if (io_alloc_async_data(req)) {
ret = -ENOMEM;
goto out;
}
memcpy(req->async_data, &__io, sizeof(__io));
return -EAGAIN;
}
if (ret == -ECONNABORTED) {
if (connect->seen_econnaborted)
goto out;
connect->seen_econnaborted = true;
}
if (req_has_async_data(req))
return -EAGAIN;
if (io_alloc_async_data(req)) {
ret = -ENOMEM;
goto out;
}
memcpy(req->async_data, &__io, sizeof(__io));
return -EAGAIN;
}
if (ret == -ERESTARTSYS)