From 6ecfe51b4082e7cff12609f97daa052ae04b61fd Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Tue, 31 Jan 2017 15:09:08 -0800 Subject: [PATCH] Input: refuse to register absolute devices without absinfo If device is supposed to send absolute events (i.e. EV_ABS bit is set in dev->evbit) but dev->absinfo is not allocated, then the driver has done something wrong, and we should not register such device. Otherwise we'll crash later, when driver tries to send absolute event. Reviewed-by: Benjamin Tissoires Acked-by: Jiri Kosina Signed-off-by: Dmitry Torokhov --- drivers/input/input.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/input/input.c b/drivers/input/input.c index 6a75bb08b9ff..067d648028a2 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -2091,6 +2091,12 @@ int input_register_device(struct input_dev *dev) const char *path; int error; + if (test_bit(EV_ABS, dev->evbit) && !dev->absinfo) { + dev_err(&dev->dev, + "Absolute device without dev->absinfo, refusing to register\n"); + return -EINVAL; + } + if (dev->devres_managed) { devres = devres_alloc(devm_input_device_unregister, sizeof(struct input_devres), GFP_KERNEL); -- 2.20.1