From fe10579b6dc3f0dac61e51e1797cacbba5039ac2 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Wed, 5 Aug 2026 22:44:23 -0700 Subject: [PATCH] Input: synaptics-rmi4 - fix GPF in suspend and resume when unbound 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: 2b6a321da9a2 ("Input: synaptics-rmi4 - add support for Synaptics RMI4 devices") Reported-by: syzbot+09103639e39c989e3ed3@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=09103639e39c989e3ed3 Cc: stable@vger.kernel.org Assisted-by: LLM Link: https://patch.msgid.link/anQe8UiyUR4x0flD@google.com Signed-off-by: Dmitry Torokhov --- drivers/input/rmi4/rmi_driver.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c index 5d49a9021c7d..a349dfd17519 100644 --- a/drivers/input/rmi4/rmi_driver.c +++ b/drivers/input/rmi4/rmi_driver.c @@ -991,6 +991,15 @@ int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake) { int retval; + /* + * Transport driver will try to suspend RMI device even if physical + * driver did not bind to the RMI device, because transport device + * (I2C, SPI) is fully registered and operational. Exit early if + * there is no driver data attached to the RMI device. + */ + if (!dev_get_drvdata(&rmi_dev->dev)) + return 0; + retval = rmi_suspend_functions(rmi_dev); if (retval) dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n", @@ -1005,6 +1014,10 @@ int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake) { int retval; + /* Skip if not fully bound to RMI driver */ + if (!dev_get_drvdata(&rmi_dev->dev)) + return 0; + rmi_enable_irq(rmi_dev, clear_wake); retval = rmi_resume_functions(rmi_dev);