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Input: cleanse capabilities bits before registering device 

To avoid showing garbage in capability bits, zero out bitmasks absent
from dev->evbit in case driver inadvertently leaves some garbage there.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2010-01-05 17:56:01 -08:00
parent 4f93df4085
commit 92a3a58788
1 changed files with 22 additions and 0 deletions
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22
drivers/input/input.c
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@ -1497,6 +1497,25 @@ void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int
}
EXPORT_SYMBOL(input_set_capability);
#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
do { \
if (!test_bit(EV_##type, dev->evbit)) \
memset(dev->bits##bit, 0, \
sizeof(dev->bits##bit)); \
} while (0)
static void input_cleanse_bitmasks(struct input_dev *dev)
{
INPUT_CLEANSE_BITMASK(dev, KEY, key);
INPUT_CLEANSE_BITMASK(dev, REL, rel);
INPUT_CLEANSE_BITMASK(dev, ABS, abs);
INPUT_CLEANSE_BITMASK(dev, MSC, msc);
INPUT_CLEANSE_BITMASK(dev, LED, led);
INPUT_CLEANSE_BITMASK(dev, SND, snd);
INPUT_CLEANSE_BITMASK(dev, FF, ff);
INPUT_CLEANSE_BITMASK(dev, SW, sw);
}
/**
* input_register_device - register device with input core
* @dev: device to be registered
@ -1522,6 +1541,9 @@ int input_register_device(struct input_dev *dev)
/* KEY_RESERVED is not supposed to be transmitted to userspace. */
__clear_bit(KEY_RESERVED, dev->keybit);
/* Make sure that bitmasks not mentioned in dev->evbit are clean. */
input_cleanse_bitmasks(dev);
/*
* If delay and period are pre-set by the driver, then autorepeating
* is handled by the driver itself and we don't do it in input.c.