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| author | Ping Cheng <pinglinux@gmail.com> | 2015-05-20 03:42:02 +0300 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2015-05-20 13:00:29 +0300 |
| commit | 26ba61f871b4aa9958bcebffcbeb558094d75928 (patch) | |
| tree | fbb6190cbfce6bda0e6e075b7bdb97d6088240fe | |
| parent | 849eca7b9dae0364e2fbe8afdf0fb610d12c9c8f (diff) | |
| download | linux-26ba61f871b4aa9958bcebffcbeb558094d75928.tar.xz | |
HID: wacom: fix an Oops caused by wacom_wac_finger_count_touches
We assumed all touch interfaces report touch data. But, Bamboo
and Intuos non-touch devices report express keys on touch
interface. We need to check touch_max before counting touches.
Reported-by: Tasos Sahanidis <tasos@tasossah.com>
Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| -rw-r--r-- | drivers/hid/wacom_wac.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index fa54d3290659..adf959dcfa5d 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -1072,6 +1072,9 @@ static int wacom_wac_finger_count_touches(struct wacom_wac *wacom) int count = 0; int i; + if (!touch_max) + return 0; + /* non-HID_GENERIC single touch input doesn't call this routine */ if ((touch_max == 1) && (wacom->features.type == HID_GENERIC)) return wacom->hid_data.tipswitch && |