io_uring: check reserved fields for recv/recvmsg
authorJens Axboe <axboe@kernel.dk>
Wed, 27 Apr 2022 01:34:57 +0000 (19:34 -0600)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 9 May 2022 07:14:38 +0000 (09:14 +0200)
[ 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

index 48c9a55..7aad4bd 100644 (file)
@@ -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);