The USB protocol allows devices to have multiple "configurations" that
the OS can switch between. A an "unconfigured" state is also possible,
especially when the device is first connected. If '__wacom_is_usb_parent'
comes across an unconfigured USB device, the 'config' variable will
be NULL. We need to add a check for this state before attempting a
dereference.
Signed-off-by: Jason Gerecke <jason.gere...@wacom.com>
---
4.5/wacom_sys.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/4.5/wacom_sys.c b/4.5/wacom_sys.c
index cfe5fa8..3a65174 100644
--- a/4.5/wacom_sys.c
+++ b/4.5/wacom_sys.c
@@ -30,7 +30,7 @@ static int __wacom_is_usb_parent(struct usb_device *usbdev,
void *ptr)
struct usb_host_config *config = usbdev->actconfig;
int i;
- for (i = 0; i < config->desc.bNumInterfaces; i++) {
+ for (i = 0; config && i < config->desc.bNumInterfaces; i++) {
if (&config->interface[i]->dev == parent)
return 1;
}
--
2.13.4
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