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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 <benjamin.tissoires@redhat.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2017-01-31 15:09:08 -08:00
parent 73d8ef7600
commit 6ecfe51b40
1 changed files with 6 additions and 0 deletions
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6
drivers/input/input.c
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@ -2091,6 +2091,12 @@ int input_register_device(struct input_dev *dev)
const char *path; const char *path;
int error; 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) { if (dev->devres_managed) {
devres = devres_alloc(devm_input_device_unregister, devres = devres_alloc(devm_input_device_unregister,
sizeof(struct input_devres), GFP_KERNEL); sizeof(struct input_devres), GFP_KERNEL);