Re: [PATCH] usbatm: fix potential NULL pointer dereference

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Signed-off-by: Duncan Sands <baldrick@xxxxxxx>

On 19/04/13 04:18, Wei Yongjun wrote:
From: Wei Yongjun <yongjun_wei@xxxxxxxxxxxxxxxxx>

The dereference to 'instance' in the debug code should be moved
below the NULL test.

Signed-off-by: Wei Yongjun <yongjun_wei@xxxxxxxxxxxxxxxxx>
---
  drivers/usb/atm/usbatm.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

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 @@ static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
  	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 @@ static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
  		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;


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