6.6-stable review patch. If anyone has any objections, please let me know.
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From: Christian Marangi ansuelsmth@gmail.com
[ Upstream commit 415798bc07dd1c1ae3a656aa026580816e0b9fe8 ]
Commit d5e01266e7f5 ("leds: trigger: netdev: add additional specific link speed mode") in the various changes, reworked the way to set the LINKUP mode in commit cee4bd16c319 ("leds: trigger: netdev: Recheck NETDEV_LED_MODE_LINKUP on dev rename") and moved it to a generic function.
This changed the logic where, in the previous implementation the dev from the trigger event was used to check if the carrier was ok, but in the new implementation with the generic function, the dev in trigger_data is used instead.
This is problematic and cause a possible kernel panic due to the fact that the dev in the trigger_data still reference the old one as the new one (passed from the trigger event) still has to be hold and saved in the trigger_data struct (done in the NETDEV_REGISTER case).
On calling of get_device_state(), an invalid net_dev is used and this cause a kernel panic.
To handle this correctly, move the call to get_device_state() after the new net_dev is correctly set in trigger_data (in the NETDEV_REGISTER case) and correctly parse the new dev.
Fixes: d5e01266e7f5 ("leds: trigger: netdev: add additional specific link speed mode") Cc: stable@vger.kernel.org Signed-off-by: Christian Marangi ansuelsmth@gmail.com Reviewed-by: Andrew Lunn andrew@lunn.ch Link: https://lore.kernel.org/r/20240203235413.1146-1-ansuelsmth@gmail.com Signed-off-by: Lee Jones lee@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/leds/trigger/ledtrig-netdev.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c index d76214fa9ad86..79719fc8a08fb 100644 --- a/drivers/leds/trigger/ledtrig-netdev.c +++ b/drivers/leds/trigger/ledtrig-netdev.c @@ -462,12 +462,12 @@ static int netdev_trig_notify(struct notifier_block *nb, trigger_data->duplex = DUPLEX_UNKNOWN; switch (evt) { case NETDEV_CHANGENAME: - get_device_state(trigger_data); - fallthrough; case NETDEV_REGISTER: dev_put(trigger_data->net_dev); dev_hold(dev); trigger_data->net_dev = dev; + if (evt == NETDEV_CHANGENAME) + get_device_state(trigger_data); break; case NETDEV_UNREGISTER: dev_put(trigger_data->net_dev);