Re: [PATCH stable-6.1 1/1] io_uring/msg_ring: fix remote queue to disabled ring

On Mon, Jan 23, 2023 at 03:03:24PM +0000, Pavel Begunkov wrote:

[ upstream commit 8579538c89e33ce78be2feb41e07489c8cbf8f31 ]

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: 6d043ee1164ca ("io_uring: do msg_ring in target task via tw")

This commit is only in 6.2-rc1, so is it really relevant for this commit to go to 6.1?

thanks,

greg k-h