The patch below does not apply to the 5.18-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From cc18cc5e82033d406f54144ad6f8092206004684 Mon Sep 17 00:00:00 2001 From: Pavel Begunkov asml.silence@gmail.com Date: Thu, 4 Aug 2022 15:13:46 +0100 Subject: [PATCH] io_uring: mem-account pbuf buckets

Potentially, someone may create as many pbuf bucket as there are indexes in an xarray without any other restrictions bounding our memory usage, put memory needed for the buckets under memory accounting.

Cc: stable@vger.kernel.org Signed-off-by: Pavel Begunkov asml.silence@gmail.com Link: https://lore.kernel.org/r/d34c452e45793e978d26e2606211ec9070d329ea.165962231... Signed-off-by: Jens Axboe axboe@kernel.dk

diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c index e538fa7cb727..a73f40a4cfe6 100644 --- a/io_uring/kbuf.c +++ b/io_uring/kbuf.c @@ -436,7 +436,7 @@ int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags)

bl = io_buffer_get_list(ctx, p->bgid); if (unlikely(!bl)) { - bl = kzalloc(sizeof(*bl), GFP_KERNEL); + bl = kzalloc(sizeof(*bl), GFP_KERNEL_ACCOUNT); if (!bl) { ret = -ENOMEM; goto err;