->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@xxxxxxxxxxxxxxx>
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
io_uring/io_uring.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 62d1f55fde55..73b841d4cfd0 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2585,12 +2585,6 @@ static void io_req_caches_free(struct io_ring_ctx *ctx)
static __cold 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_refs_drop(ctx);
/* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */
io_wait_rsrc_data(ctx->buf_data);
@@ -2633,6 +2627,10 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list));
WARN_ON_ONCE(ctx->notif_slots || ctx->nr_notif_slots);
+ if (ctx->mm_account) {
+ mmdrop(ctx->mm_account);
+ ctx->mm_account = NULL;
+ }
io_mem_free(ctx->rings);
io_mem_free(ctx->sq_sqes);
--
2.37.3
