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nbd: fix a block_device refcount leak in nbd_release

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[ Upstream commit 2bd645b2d3f0bacadaa6037f067538e1cd4e42ef ]

bdget_disk needs to be paired with bdput to not leak a reference
on the block device inode.

Fixes: 08ba91ee6e ("nbd: Add the nbd NBD_DISCONNECT_ON_CLOSE config flag.")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christoph Hellwig 2020-11-09 18:30:59 +01:00 • committed by Greg Kroah-Hartman
commit 81dcfdb9a0
1 changed files with 1 additions and 0 deletions
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1
drivers/block/nbd.c
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@ -1503,6 +1503,7 @@ static void nbd_release(struct gendisk *disk, fmode_t mode)
if (test_bit(NBD_RT_DISCONNECT_ON_CLOSE, &nbd->config->runtime_flags) &&
bdev->bd_openers == 0)
nbd_disconnect_and_put(nbd);
bdput(bdev);
nbd_config_put(nbd);
nbd_put(nbd);