[PATCH v2 1/2] gpiolib: cdev: fix NULL-pointer dereferences

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

There are several places where we can crash the kernel by requesting
lines, unbinding the GPIO device, then calling any of the system calls
relevant to the GPIO character device's annonymous file descriptors:
ioctl(), read(), poll().

While I observed it with the GPIO simulator, it will also happen for any
of the GPIO devices that can be hot-unplugged - for instance any HID GPIO
expander (e.g. CP2112).

This affects both v1 and v2 uAPI.

This fixes it partially by checking if gdev->chip is not NULL but it
doesn't entirely remedy the situation as we still have a race condition
in which another thread can remove the device after the check.

Fixes: d7c51b47ac11 ("gpio: userspace ABI for reading/writing GPIO lines")
Fixes: 3c0d9c635ae2 ("gpiolib: cdev: support GPIO_V2_GET_LINE_IOCTL and GPIO_V2_LINE_GET_VALUES_IOCTL")
Fixes: aad955842d1c ("gpiolib: cdev: support GPIO_V2_GET_LINEINFO_IOCTL and GPIO_V2_GET_LINEINFO_WATCH_IOCTL")
Fixes: a54756cb24ea ("gpiolib: cdev: support GPIO_V2_LINE_SET_CONFIG_IOCTL")
Fixes: 7b8e00d98168 ("gpiolib: cdev: support GPIO_V2_LINE_SET_VALUES_IOCTL")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
---
 drivers/gpio/gpiolib-cdev.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 0cb6b468f364..7a9504fb27f1 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -195,12 +195,16 @@ static long linehandle_ioctl(struct file *file, unsigned int cmd,
 			     unsigned long arg)
 {
 	struct linehandle_state *lh = file->private_data;
+	struct gpio_device *gdev = lh->gdev;
 	void __user *ip = (void __user *)arg;
 	struct gpiohandle_data ghd;
 	DECLARE_BITMAP(vals, GPIOHANDLES_MAX);
 	unsigned int i;
 	int ret;
 
+	if (!gdev->chip)
+		return -ENODEV;
+
 	switch (cmd) {
 	case GPIOHANDLE_GET_LINE_VALUES_IOCTL:
 		/* NOTE: It's okay to read values of output lines */
@@ -1382,8 +1386,12 @@ static long linereq_ioctl(struct file *file, unsigned int cmd,
 			  unsigned long arg)
 {
 	struct linereq *lr = file->private_data;
+	struct gpio_device *gdev = lr->gdev;
 	void __user *ip = (void __user *)arg;
 
+	if (!gdev->chip)
+		return -ENODEV;
+
 	switch (cmd) {
 	case GPIO_V2_LINE_GET_VALUES_IOCTL:
 		return linereq_get_values(lr, ip);
@@ -1408,8 +1416,12 @@ static __poll_t linereq_poll(struct file *file,
 			    struct poll_table_struct *wait)
 {
 	struct linereq *lr = file->private_data;
+	struct gpio_device *gdev = lr->gdev;
 	__poll_t events = 0;
 
+	if (!gdev->chip)
+		return 0;
+
 	poll_wait(file, &lr->wait, wait);
 
 	if (!kfifo_is_empty_spinlocked_noirqsave(&lr->events,
@@ -1425,10 +1437,14 @@ static ssize_t linereq_read(struct file *file,
 			    loff_t *f_ps)
 {
 	struct linereq *lr = file->private_data;
+	struct gpio_device *gdev = lr->gdev;
 	struct gpio_v2_line_event le;
 	ssize_t bytes_read = 0;
 	int ret;
 
+	if (!gdev->chip)
+		return -ENODEV;
+
 	if (count < sizeof(le))
 		return -EINVAL;
 
@@ -1714,8 +1730,12 @@ static __poll_t lineevent_poll(struct file *file,
 			       struct poll_table_struct *wait)
 {
 	struct lineevent_state *le = file->private_data;
+	struct gpio_device *gdev = le->gdev;
 	__poll_t events = 0;
 
+	if (!gdev->chip)
+		return 0;
+
 	poll_wait(file, &le->wait, wait);
 
 	if (!kfifo_is_empty_spinlocked_noirqsave(&le->events, &le->wait.lock))
@@ -1735,11 +1755,15 @@ static ssize_t lineevent_read(struct file *file,
 			      loff_t *f_ps)
 {
 	struct lineevent_state *le = file->private_data;
+	struct gpio_device *gdev = le->gdev;
 	struct gpioevent_data ge;
 	ssize_t bytes_read = 0;
 	ssize_t ge_size;
 	int ret;
 
+	if (!gdev->chip)
+		return -ENODEV;
+
 	/*
 	 * When compatible system call is being used the struct gpioevent_data,
 	 * in case of at least ia32, has different size due to the alignment
@@ -1818,9 +1842,13 @@ static long lineevent_ioctl(struct file *file, unsigned int cmd,
 			    unsigned long arg)
 {
 	struct lineevent_state *le = file->private_data;
+	struct gpio_device *gdev = le->gdev;
 	void __user *ip = (void __user *)arg;
 	struct gpiohandle_data ghd;
 
+	if (!gdev->chip)
+		return -ENODEV;
+
 	/*
 	 * We can get the value for an event line but not set it,
 	 * because it is input by definition.
@@ -2405,8 +2433,12 @@ static __poll_t lineinfo_watch_poll(struct file *file,
 				    struct poll_table_struct *pollt)
 {
 	struct gpio_chardev_data *cdev = file->private_data;
+	struct gpio_device *gdev = cdev->gdev;
 	__poll_t events = 0;
 
+	if (!gdev->chip)
+		return 0;
+
 	poll_wait(file, &cdev->wait, pollt);
 
 	if (!kfifo_is_empty_spinlocked_noirqsave(&cdev->events,
@@ -2420,11 +2452,15 @@ static ssize_t lineinfo_watch_read(struct file *file, char __user *buf,
 				   size_t count, loff_t *off)
 {
 	struct gpio_chardev_data *cdev = file->private_data;
+	struct gpio_device *gdev = cdev->gdev;
 	struct gpio_v2_line_info_changed event;
 	ssize_t bytes_read = 0;
 	int ret;
 	size_t event_size;
 
+	if (!gdev->chip)
+		return -ENODEV;
+
 #ifndef CONFIG_GPIO_CDEV_V1
 	event_size = sizeof(struct gpio_v2_line_info_changed);
 	if (count < event_size)
-- 
2.37.2