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Dmitry Torokhov
fe10579b6d
Transport drivers (such as rmi_i2c and rmi_spi) invoke
rmi_driver_suspend() and rmi_driver_resume() on their child rmi_dev
device during system power management events. However, transport drivers
are fully registered and operational even if the physical RMI driver
failed to bind or probe the rmi_dev device.
When rmi_driver_suspend() or rmi_driver_resume() is called on an unbound
rmi_dev, dev_get_drvdata() returns NULL. Calling rmi_disable_irq() or
rmi_enable_irq() without driver data attached causes a NULL pointer
dereference and General Protection Fault when attempting to lock
data->enabled_mutex.
Fix this by checking if driver data is attached to rmi_dev in
rmi_driver_suspend() and rmi_driver_resume(), exiting early if
no driver data is present.
Fixes: 2b6a321da9 ("Input: synaptics-rmi4 - add support for Synaptics RMI4 devices")
Reported-by: [email protected]
Closes: https://syzkaller.appspot.com/bug?extid=09103639e39c989e3ed3
Cc: [email protected]
Assisted-by: LLM
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>