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sunvdc: Balance device refcount in vdc_port_mpgroup_check

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commit 63ce53724637e2e7ba51fe3a4f78351715049905 upstream.

Using device_find_child() to locate a probed virtual-device-port node
causes a device refcount imbalance, as device_find_child() internally
calls get_device() to increment the device’s reference count before
returning its pointer. vdc_port_mpgroup_check() directly returns true
upon finding a matching device without releasing the reference via
put_device(). We should call put_device() to decrement refcount.

As comment of device_find_child() says, 'NOTE: you will need to drop
the reference with put_device() after use'.

Found by code review.

Cc: stable@vger.kernel.org
Fixes: 3ee70591d6 ("sunvdc: prevent sunvdc panic when mpgroup disk added to guest domain")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Link: https://lore.kernel.org/r/20250719075856.3447953-1-make24@iscas.ac.cn
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ma Ke 2025-07-19 15:58:56 +08:00 • committed by Greg Kroah-Hartman
commit 944474274e
1 changed files with 3 additions and 1 deletions
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4
drivers/block/sunvdc.c
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@ -967,8 +967,10 @@ static bool vdc_port_mpgroup_check(struct vio_dev *vdev)
dev = device_find_child(vdev->dev.parent, &port_data,
vdc_device_probed);
if (dev)
if (dev) {
put_device(dev);
return true;
}
return false;
}