io_uring: check reserved fields for send/sendmsg

[ Upstream commit 588faa1ea5eecb351100ee5d187b9be99210f70d ]

We should check unused fields for non-zero and -EINVAL if they are set,
making it consistent with other opcodes.

Fixes: 0fa03c624d8f ("io_uring: add support for sendmsg()")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 1bf1ea2..48c9a55 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4786,6 +4786,8 @@ static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 
        if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
                return -EINVAL;
+       if (unlikely(sqe->addr2 || sqe->file_index))
+               return -EINVAL;
 
        sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
        sr->len = READ_ONCE(sqe->len);