[PATCH 4.9 49/94] HID: wacom: Have wacom_tpc_irq guard against possible NULL dereference

Greg Kroah-Hartman
2017-06-05T16:25:13Z

From: Jason Gerecke <killertofu@gmail.com>

commit 2ac97f0f6654da14312d125005c77a6010e0ea38 upstream.

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.

Fixes: 2a6cdbd ("HID: wacom: Introduce new 'touch_input' device")
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/hid/wacom_wac.c | 47 ++++++++++++++++++++++++-----------------------
1 file changed, 24 insertions(+), 23 deletions(-)

--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1400,37 +1400,38 @@ static int wacom_tpc_irq(struct wacom_wa
{
unsigned char *data = wacom->data;

- if (wacom->pen_input)
+ if (wacom->pen_input) {
dev_dbg(wacom->pen_input->dev.parent,
"%s: received report #%d\n", __func__, data[0]);
- else if (wacom->touch_input)
+
+ if (len == WACOM_PKGLEN_PENABLED ||
+ data[0] == WACOM_REPORT_PENABLED)
+ return wacom_tpc_pen(wacom);
+ }
+ else if (wacom->touch_input) {
dev_dbg(wacom->touch_input->dev.parent,
"%s: received report #%d\n", __func__, data[0]);

- switch (len) {
- case WACOM_PKGLEN_TPC1FG:
- return wacom_tpc_single_touch(wacom, len);
-
- case WACOM_PKGLEN_TPC2FG:
- return wacom_tpc_mt_touch(wacom);
-
- case WACOM_PKGLEN_PENABLED:
- return wacom_tpc_pen(wacom);
-
- default:
- switch (data[0]) {
- case WACOM_REPORT_TPC1FG:
- case WACOM_REPORT_TPCHID:
- case WACOM_REPORT_TPCST:
- case WACOM_REPORT_TPC1FGE:
+ switch (len) {
+ case WACOM_PKGLEN_TPC1FG:
return wacom_tpc_single_touch(wacom, len);

- case WACOM_REPORT_TPCMT:
- case WACOM_REPORT_TPCMT2:
- return wacom_mt_touch(wacom);
+ case WACOM_PKGLEN_TPC2FG:
+ return wacom_tpc_mt_touch(wacom);

- case WACOM_REPORT_PENABLED:
- return wacom_tpc_pen(wacom);
+ default:
+ switch (data[0]) {
+ case WACOM_REPORT_TPC1FG:
+ case WACOM_REPORT_TPCHID:
+ case WACOM_REPORT_TPCST:
+ case WACOM_REPORT_TPC1FGE:
+ return wacom_tpc_single_touch(wacom, len);
+
+ case WACOM_REPORT_TPCMT:
+ case WACOM_REPORT_TPCMT2:
+ return wacom_mt_touch(wacom);
+
+ }
}
}