Since commit dcbd1c054848 ("io_uring/net: let io_recv_buf_select return the length of the buffer region"), io_recv_buf_select() returns the selected length as an int. For a non-bundle recv with sqe->len == 0 the length comes from the ring provided buffer, which can be up to 4G, so a buffer of 2G or more makes io_recv() fail the request with a bogus negative result (e.g. -2147483648) instead of receiving into it. Clamp the length to MAX_RW_COUNT, which import_ubuf() limits the transfer to anyway. Fixes: dcbd1c054848 ("io_uring/net: let io_recv_buf_select return the length of the buffer region") Signed-off-by: Tamaki Yanagawa Assisted-by: Claude:claude-opus-5-5 --- io_uring/net.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/io_uring/net.c b/io_uring/net.c index f5f4f3ce6e..c82ea46cf5 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -1178,6 +1178,8 @@ static int io_recv_buf_select(struct io_kiocb *req, struct io_async_msghdr *kmsg *sel = io_buffer_select(req, &len, sr->buf_group, issue_flags); if (!sel->addr) return -ENOBUFS; + /* ring provided buffers can be up to 4G, keep len an int */ + len = min_t(size_t, len, MAX_RW_COUNT); sr->buf = sel->addr; sr->len = len; map_ubuf: base-commit: fddcf4c5321b3ea5f72166c3fd36a9d1c34f80c7 -- 2.52.0.windows.1