io_uring: correct pinned_vm accounting

[ upstream commit 42b6419d0aba47c5d8644cdc0b68502254671de5 ]

->mm_account should be released only after we free all registered
buffers, otherwise __io_sqe_buffers_unregister() will see a NULL
->mm_account and skip locked_vm accounting.

Cc: <Stable@vger.kernel.org>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/6d798f65ed4ab8db3664c4d3397d4af16ca98846.1664849932.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/fs/io_uring.c b/fs/io_uring.c
index b94cbac..4d32483 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9303,11 +9303,6 @@ static void io_ring_ctx_free(struct io_ring_ctx *ctx)
 {
        io_sq_thread_finish(ctx);
 
-       if (ctx->mm_account) {
-               mmdrop(ctx->mm_account);
-               ctx->mm_account = NULL;
-       }
-
        /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */
        io_wait_rsrc_data(ctx->buf_data);
        io_wait_rsrc_data(ctx->file_data);
@@ -9343,6 +9338,11 @@ static void io_ring_ctx_free(struct io_ring_ctx *ctx)
 #endif
        WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list));
 
+       if (ctx->mm_account) {
+               mmdrop(ctx->mm_account);
+               ctx->mm_account = NULL;
+       }
+
        io_mem_free(ctx->rings);
        io_mem_free(ctx->sq_sqes);