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io_uring: correct pinned_vm accounting 

commit 42b6419d0a upstream.

->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 2022-10-04 03:19:08 +01:00 committed by Greg Kroah-Hartman
parent b4293c01ee
commit 796da2e0ef
1 changed files with 4 additions and 6 deletions
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10
io_uring/io_uring.c
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@ -10711,12 +10711,6 @@ static void io_flush_apoll_cache(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);
@ -10755,6 +10749,10 @@ static __cold 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);