From: Pavel Begunkov <asml.silence@xxxxxxxxx> [ 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@xxxxxxxxxxxxxxx> Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx> Link: https://lore.kernel.org/r/6d798f65ed4ab8db3664c4d3397d4af16ca98846.1664849932.git.asml.silence@xxxxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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);
