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io_uring: correct pinned_vm accounting

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[ 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>
This commit is contained in:
Pavel Begunkov 2022-10-16 23:31:25 +01:00 committed by Greg Kroah-Hartman
parent 904f881b57
commit 67cbc8865a
1 changed files with 5 additions and 2 deletions
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7
fs/io_uring.c
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@ -8436,8 +8436,6 @@ static void io_ring_ctx_free(struct io_ring_ctx *ctx)
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_ring_ctx *ctx)
}
#endif
if (ctx->mm_account) {
mmdrop(ctx->mm_account);
ctx->mm_account = NULL;
}
io_mem_free(ctx->rings);
io_mem_free(ctx->sq_sqes);