[PATCH 5.15 112/177] io_uring: check reserved fields for recv/recvmsg

Greg Kroah-Hartman
2022-05-04T17:23:44Z

From: Jens Axboe <axboe@kernel.dk>

[ Upstream commit 5a1e99b61b0c81388cde0c808b3e4173907df19f ]

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

Fixes: aa1fa28fc73e ("io_uring: add support for recvmsg()")
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 48c9a550e48c..7aad4bde92e9 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5009,6 +5009,8 @@ static int io_recvmsg_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