[PATCH 5.15 111/177] io_uring: check reserved fields for send/sendmsg

Greg Kroah-Hartman
2022-05-04T17:23:07Z

From: Jens Axboe <axboe@kernel.dk>

[ 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>
---
fs/io_uring.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 1bf1ea2cd8b0..48c9a550e48c 100644
--- 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);
--
2.35.1