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net: gianfar: fix device leak when querying time stamp info

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commit da717540acd34e5056e3fa35791d50f6b3303f55 upstream.

Make sure to drop the reference to the ptp device taken by
of_find_device_by_node() when querying the time stamping capabilities.

Note that holding a reference to the ptp device does not prevent its
driver data from going away.

Fixes: 7349a74ea7 ("net: ethernet: gianfar_ethtool: get phc index through drvdata")
Cc: stable@vger.kernel.org	# 4.18
Cc: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250725171213.880-4-johan@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2025-07-25 19:12:11 +02:00 • committed by Greg Kroah-Hartman
commit aecfeb82dd
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/freescale/gianfar_ethtool.c
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@ -1490,8 +1490,10 @@ static int gfar_get_ts_info(struct net_device *dev,
if (ptp_node) {
ptp_dev = of_find_device_by_node(ptp_node);
of_node_put(ptp_node);
if (ptp_dev)
if (ptp_dev) {
ptp = platform_get_drvdata(ptp_dev);
put_device(&ptp_dev->dev);
}
}
if (ptp)