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

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: 3fb1bd688172 ("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>

diff --git a/io_uring/net.c b/io_uring/net.c
index b7f190c..4040cf0 100644 (file)
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -47,6 +47,7 @@ struct io_connect {
        struct sockaddr __user          *addr;
        int                             addr_len;
        bool                            in_progress;
+       bool                            seen_econnaborted;
 };
 
 struct io_sr_msg {
@@ -1424,7 +1425,7 @@ 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;
 }
 
@@ -1461,18 +1462,24 @@ 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;
+                       return -EAGAIN;
+               }
+               if (ret == -ECONNABORTED) {
+                       if (connect->seen_econnaborted)
                                goto out;
-                       }
-                       memcpy(req->async_data, &__io, sizeof(__io));
+                       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)