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Subject[PATCH 5.10 378/390] io_uring: correct pinned_vm accounting
Date
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/6d798f65ed4ab8db3664c4d3397d4af16ca98846.1664849932.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/io_uring.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8436,8 +8436,6 @@ static void io_ring_ctx_free(struct io_r
if (ctx->sqo_task) {
put_task_struct(ctx->sqo_task);
ctx->sqo_task = NULL;
- mmdrop(ctx->mm_account);
- ctx->mm_account = NULL;
}

#ifdef CONFIG_BLK_CGROUP
@@ -8456,6 +8454,11 @@ static void io_ring_ctx_free(struct io_r
}
#endif

+ if (ctx->mm_account) {
+ mmdrop(ctx->mm_account);
+ ctx->mm_account = NULL;
+ }
+
io_mem_free(ctx->rings);
io_mem_free(ctx->sq_sqes);


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