io_uring/kbuf: account ring io_buffer_list memory

Commit 475a8d30371604a6363da8e304a608a5959afc40 upstream.

Follow the non-ringed pbuf struct io_buffer_list allocations and account
it against the memcg. There is low chance of that being an actual
problem as ring provided buffer should either pin user memory or
allocate it, which is already accounted.

Cc: stable@vger.kernel.org # 6.1
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3985218b50d341273cafff7234e1a7e6d0db9808.1747150490.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c
index 147ada2ce7472aaf480a04017339bb6031cba5bd..d18fe3996ddb411b12fc1a600b47a035bbe5c8a4 100644 (file)
--- a/io_uring/kbuf.c
+++ b/io_uring/kbuf.c
@@ -510,7 +510,7 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
                if (bl->buf_nr_pages || !list_empty(&bl->buf_list))
                        return -EEXIST;
        } else {
-               free_bl = bl = kzalloc(sizeof(*bl), GFP_KERNEL);
+               free_bl = bl = kzalloc(sizeof(*bl), GFP_KERNEL_ACCOUNT);
                if (!bl)
                        return -ENOMEM;
        }