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nbd: set nbd->index before releasing nbd_index_mutex

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Set nbd->index before releasing nbd_index_mutex, as populate_nbd_status()
might access nbd->index as soon as nbd_index_mutex is released.

Fixes: 6e4df4c648 ("nbd: reduce the nbd_index_mutex scope")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
[hch: split from a larger patch]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210825163108.50713-5-hch@lst.de
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tetsuo Handa 2021-08-25 18:31:06 +02:00 committed by Jens Axboe
parent 75b7f62aa6
commit b190300dec
1 changed files with 1 additions and 1 deletions
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2
drivers/block/nbd.c
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@ -1720,10 +1720,10 @@ static struct nbd_device *nbd_dev_add(int index, unsigned int refs)
if (err >= 0)
index = err;
}
nbd->index = index;
mutex_unlock(&nbd_index_mutex);
if (err < 0)
goto out_free_tags;
nbd->index = index;
disk = blk_mq_alloc_disk(&nbd->tag_set, NULL);
if (IS_ERR(disk)) {