[PATCH v1 1/2] usb: gadget: u_ether: fix another dereference after null check

[Harish Jenny K N]

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_bax...@mentor.com>
Signed-off-by: Harish Jenny K N <harish_kand...@mentor.com>
---
 drivers/usb/gadget/function/u_ether.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/u_ether.c 
b/drivers/usb/gadget/function/u_ether.c
index 3be4b93..9c8c9ed 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;
-- 
1.7.9.5