io_uring: mem-account pbuf buckets

commit cc18cc5e82033d406f54144ad6f8092206004684 upstream.

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.1659622312.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/io_uring.c b/io_uring/io_uring.c
index 27ce532c6c8da232c5f98744876e19e8be216d80..6a67dbf5195f003ad7b2aa0f6eac026b2a0f1769 100644 (file)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -5520,7 +5520,7 @@ static 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;