From 5a1e99b61b0c81388cde0c808b3e4173907df19f Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Tue, 26 Apr 2022 19:34:57 -0600
Subject: [PATCH] io_uring: check reserved fields for recv/recvmsg
Git-commit: 5a1e99b61b0c81388cde0c808b3e4173907df19f
Patch-mainline: v5.18-rc5
References: bsc#1205205

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: Gabriel Krisman Bertazi <krisman@suse.de>
---
 fs/io_uring.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 136c2fc49a1e..92ac50f139cd 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5420,6 +5420,8 @@ 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);
-- 
2.35.3