Re: [PATCH 6.12.y 6.13.y] io_uring/kbuf: reallocate buf lists on upgrade

On 2/19/25 01:28, Pavel Begunkov wrote:

[ upstream commit 8802766324e1f5d414a81ac43365c20142e85603 ]

IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it was created for legacy selected buffer and has been emptied. It violates the requirement that most of the field should stay stable after publish. Always reallocate it instead.

Just a note that it should apply to 6.13 and 6.12, can you pick it for both of them?