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

[cascardo/linux.git] / drivers / usb / gadget / function / f_eem.c

diff --git a/drivers/usb/gadget/function/f_eem.c b/drivers/usb/gadget/function/f_eem.c
index d58bfc3..8741fd7 100644 (file)
--- a/drivers/usb/gadget/function/f_eem.c
+++ b/drivers/usb/gadget/function/f_eem.c
@@ -341,11 +341,15 @@ static struct sk_buff *eem_wrap(struct gether *port, struct sk_buff *skb)
 {
        struct sk_buff  *skb2 = NULL;
        struct usb_ep   *in = port->in_ep;
-       int             padlen = 0;
+       int             headroom, tailroom, padlen = 0;
        u16             len = skb->len;
 
-       int headroom = skb_headroom(skb);
-       int tailroom = skb_tailroom(skb);
+       if (!skb)
+               return NULL;
+
+       len = skb->len;
+       headroom = skb_headroom(skb);
+       tailroom = skb_tailroom(skb);
 
        /* When (len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) is 0,
         * stick two bytes of zero-length EEM packet on the end.