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-rw-r--r--drivers/gpio/gpiolib.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index b5b1a8425907..20e09b7c2de3 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -556,6 +556,10 @@ struct lineevent_state {
struct mutex read_lock;
};
+#define GPIOEVENT_REQUEST_VALID_FLAGS \
+ (GPIOEVENT_REQUEST_RISING_EDGE | \
+ GPIOEVENT_REQUEST_FALLING_EDGE)
+
static unsigned int lineevent_poll(struct file *filep,
struct poll_table_struct *wait)
{
@@ -753,6 +757,13 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
goto out_free_label;
}
+ /* Return an error if a unknown flag is set */
+ if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) ||
+ (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS)) {
+ ret = -EINVAL;
+ goto out_free_label;
+ }
+
/* This is just wrong: we don't look for events on output lines */
if (lflags & GPIOHANDLE_REQUEST_OUTPUT) {
ret = -EINVAL;