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io_uring/msg_ring: fix remote queue to disabled ring 

commit 8579538c89 upstream.

IORING_SETUP_R_DISABLED rings don't have the submitter task set, so
it's not always safe to use ->submitter_task. Disallow posting msg_ring
messaged to disabled rings. Also add task NULL check for loosy sync
around testing for IORING_SETUP_R_DISABLED.

Cc: stable@vger.kernel.org
Fixes: 6d043ee116 ("io_uring: do msg_ring in target task via tw")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov 2023-01-20 16:38:06 +00:00 committed by Greg Kroah-Hartman
parent 3964b0c2e8
commit c932501bc2
1 changed files with 4 additions and 0 deletions
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4
io_uring/msg_ring.c
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@ -30,6 +30,8 @@ static int io_msg_ring_data(struct io_kiocb *req)
if (msg->src_fd || msg->dst_fd || msg->flags)
return -EINVAL;
if (target_ctx->flags & IORING_SETUP_R_DISABLED)
return -EBADFD;
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0, true))
return 0;
@ -84,6 +86,8 @@ static int io_msg_send_fd(struct io_kiocb *req, unsigned int issue_flags)
if (target_ctx == ctx)
return -EINVAL;
if (target_ctx->flags & IORING_SETUP_R_DISABLED)
return -EBADFD;
ret = io_double_lock_ctx(ctx, target_ctx, issue_flags);
if (unlikely(ret))