In eth_start_xmit, the socket buffer may be NULL. So, add NULL pointer
check at .wrap API.

Signed-off-by: Peter Chen <peter.c...@nxp.com>
---
 drivers/usb/gadget/function/f_rndis.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/gadget/function/f_rndis.c 
b/drivers/usb/gadget/function/f_rndis.c
index c800582..16562e4 100644
--- a/drivers/usb/gadget/function/f_rndis.c
+++ b/drivers/usb/gadget/function/f_rndis.c
@@ -374,6 +374,9 @@ static struct sk_buff *rndis_add_header(struct gether *port,
 {
        struct sk_buff *skb2;
 
+       if (!skb)
+               return NULL;
+
        skb2 = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type));
        rndis_add_hdr(skb2);
 
-- 
1.9.1

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