On Tue, 25 Apr 2017, Jason Gerecke wrote:
> The following Smatch complaint was generated in response to commit
> 2a6cdbd ("HID: wacom: Introduce new 'touch_input' device"):
>
> drivers/hid/wacom_wac.c:1586 wacom_tpc_irq()
> error: we previously assumed 'wacom->touch_input' could be null (see line 1577)
>
> The 'touch_input' and 'pen_input' variables point to the 'struct input_dev'
> used for relaying touch and pen events to userspace, respectively. If a
> device does not have a touch interface or pen interface, the associated
> input variable is NULL. The 'wacom_tpc_irq()' function is responsible for
> forwarding input reports to a more-specific IRQ handler function. An
> unknown report could theoretically be mistaken as e.g. a touch report
> on a device which does not have a touch interface. This can be prevented
> by only calling the pen/touch functions are called when the pen/touch
> pointers are valid.
>
> Signed-off-by: Jason Gerecke <jason.gerecke@xxxxxxxxx>
Applied to for-4.12/upstream-fixes branch with these tags:
Fixes: 2a6cdbd ("HID: wacom: Introduce new 'touch_input' device")
Signed-off-by: Jason Gerecke <jason.gerecke@xxxxxxxxx>
Reviewed-by: Ping Cheng <ping.cheng@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
--
Jiri Kosina
SUSE Labs
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