usb: gadget: u_ether: fix another dereference after null check

dev->port_usb is checked for null pointer previously, so dev->port_usb
might be null during no zlp check, fix it by adding null pointer check.

Acked-by: Jim Baxter <jim_baxter@mentor.com>
Signed-off-by: Harish Jenny K N <harish_kandiga@mentor.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index 3be4b93fd415..9c8c9ed1dc9e 100644
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -571,7 +571,8 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
         req->complete = tx_complete;
 
         /* NCM requires no zlp if transfer is dwNtbInMaxSize */
-        if (dev->port_usb->is_fixed &&
+        if (dev->port_usb &&
+            dev->port_usb->is_fixed &&
             length == dev->port_usb->fixed_in_len &&
             (length % in->maxpacket) == 0)
                 req->zero = 0;