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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2010-01-05 17:56:01 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2010-01-06 00:27:29 -0800
commit92a3a58788790645c6143b5353ef065fd26110bb (patch)
treee84cffdd0198641ce02ae65c2449070b21710847 /drivers/input/input.c
parent4f93df40859cf471774f6ef3ec7f2870c2e8e260 (diff)
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>
Diffstat (limited to 'drivers/input/input.c')
-rw-r--r--drivers/input/input.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 910d7be06eff..a31394c1eca8 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -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.