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Jason Gerecke authored
The following Smatch complaint was generated in response to commit 2a6cdbdd ("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. Fixes: 2a6cdbdd ("HID: wacom: Introduce new 'touch_input' device") Signed-off-by:
Jason Gerecke <jason.gerecke@wacom.com> Reviewed-by:
Ping Cheng <ping.cheng@wacom.com> Cc: stable@vger.kernel.org Signed-off-by:
Jiri Kosina <jkosina@suse.cz>
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