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

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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>
This commit is contained in:
Peter Chen 2016-08-11 15:51:45 +08:00 committed by Felipe Balbi
parent 3295235fd7
commit 70237dc8ef
1 changed files with 7 additions and 3 deletions
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10
drivers/usb/gadget/function/f_eem.c
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@ -341,11 +341,15 @@ static struct sk_buff *eem_wrap(struct gether *port, struct sk_buff *skb)
{ {
struct sk_buff *skb2 = NULL; struct sk_buff *skb2 = NULL;
struct usb_ep *in = port->in_ep; struct usb_ep *in = port->in_ep;
int padlen = 0; int headroom, tailroom, padlen = 0;
u16 len = skb->len; u16 len = skb->len;
int headroom = skb_headroom(skb); if (!skb)
int tailroom = skb_tailroom(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, /* When (len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) is 0,
* stick two bytes of zero-length EEM packet on the end. * stick two bytes of zero-length EEM packet on the end.