usbatm: fix potential NULL pointer dereference
The dereference to 'instance' in the debug code should be moved
below the NULL test.
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Duncan Sands <baldrick@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/atm/usbatm.c b/drivers/usb/atm/usbatm.c
index 35f10bf..d3527dd 100644
--- a/drivers/usb/atm/usbatm.c
+++ b/drivers/usb/atm/usbatm.c
@@ -672,9 +672,6 @@
struct usbatm_control *ctrl = UDSL_SKB(skb);
int err;
- vdbg(&instance->usb_intf->dev, "%s called (skb 0x%p, len %u)", __func__,
- skb, skb->len);
-
/* racy disconnection check - fine */
if (!instance || instance->disconnected) {
#ifdef DEBUG
@@ -684,6 +681,9 @@
goto fail;
}
+ vdbg(&instance->usb_intf->dev, "%s called (skb 0x%p, len %u)", __func__,
+ skb, skb->len);
+
if (vcc->qos.aal != ATM_AAL5) {
atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
err = -EINVAL;