usb: gadget: function: f_rndis: socket buffer may be NULL

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

Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/gadget/function/f_rndis.c b/drivers/usb/gadget/function/f_rndis.c
index c8005823b190..16562e461121 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);