From: Jens Axboe <axboe@kernel.dk>
Date: Wed, 27 Apr 2022 01:34:11 +0000 (-0600)
Subject: io_uring: check reserved fields for send/sendmsg
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=588faa1ea5eecb351100ee5d187b9be99210f70d;p=linux.git

io_uring: check reserved fields for send/sendmsg

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>
---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 7625b29153b92..136c2fc49a1ee 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5207,6 +5207,8 @@ 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);