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io_uring: check reserved fields for recv/recvmsg 

[ Upstream commit 5a1e99b61b0c81388cde0c808b3e4173907df19f ]

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

Fixes: aa1fa28fc7 ("io_uring: add support for recvmsg()")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jens Axboe 2022-04-26 19:34:57 -06:00 committed by Greg Kroah-Hartman
parent 79c10cb188
commit 37811e46a2
1 changed files with 2 additions and 0 deletions
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2
fs/io_uring.c
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@ -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);