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io_uring: get an active ref_node from files_data

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An active ref_node always can be found in ctx->files_data, it's much
safer to get it this way instead of poking into files_data->ref_list.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Cc: stable@vger.kernel.org # v5.7+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-11-18 14:56:25 +00:00 committed by Jens Axboe
parent c993df5a68
commit 1e5d770bb8
1 changed files with 1 additions and 3 deletions
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4
fs/io_uring.c
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@ -6974,9 +6974,7 @@ static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
return -ENXIO; return -ENXIO;
spin_lock(&data->lock); spin_lock(&data->lock);
if (!list_empty(&data->ref_list)) ref_node = data->node;
ref_node = list_first_entry(&data->ref_list,
struct fixed_file_ref_node, node);
spin_unlock(&data->lock); spin_unlock(&data->lock);
if (ref_node) if (ref_node)
percpu_ref_kill(&ref_node->refs); percpu_ref_kill(&ref_node->refs);