From: Pavel Begunkov asml.silence@gmail.com
[ 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/6d798f65ed4ab8db3664c4d3397d4af16ca98846.166484993... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/io_uring.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -9303,11 +9303,6 @@ static void io_ring_ctx_free(struct io_r { 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_r #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);