linux-kernel - [PATCH AUTOSEL 6.12 010/486] io_uring/msg: initialise msg request opcode

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Message-Id: <20250505223922.2682012-10-sashal@kernel.org>
Date: Mon,  5 May 2025 18:31:26 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Pavel Begunkov <asml.silence@...il.com>,
	Jens Axboe <axboe@...nel.dk>,
	Sasha Levin <sashal@...nel.org>,
	io-uring@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 010/486] io_uring/msg: initialise msg request opcode

From: Pavel Begunkov <asml.silence@...il.com>

[ Upstream commit 9cc0bbdaba2a66ad90bc6ce45163b7745baffe98 ]

It's risky to have msg request opcode set to garbage, so at least
initialise it to nop. Later we might want to add a user inaccessible
opcode for such cases.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Link: https://lore.kernel.org/r/9afe650fcb348414a4529d89f52eb8969ba06efd.1743190078.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 io_uring/msg_ring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/io_uring/msg_ring.c b/io_uring/msg_ring.c
index 7fd9badcfaf81..35b1b585e9cbe 100644
--- a/io_uring/msg_ring.c
+++ b/io_uring/msg_ring.c
@@ -94,6 +94,7 @@ static int io_msg_remote_post(struct io_ring_ctx *ctx, struct io_kiocb *req,
 		kmem_cache_free(req_cachep, req);
 		return -EOWNERDEAD;
 	}
+	req->opcode = IORING_OP_NOP;
 	req->cqe.user_data = user_data;
 	io_req_set_res(req, res, cflags);
 	percpu_ref_get(&ctx->refs);
-- 
2.39.5