From 70237dc8efd092b93b40dc2eba812d66a5d65cb1 Mon Sep 17 00:00:00 2001 From: Peter Chen Date: Thu, 11 Aug 2016 15:51:45 +0800 Subject: [PATCH] usb: gadget: function: f_eem: 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 Signed-off-by: Felipe Balbi --- drivers/usb/gadget/function/f_eem.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/usb/gadget/function/f_eem.c b/drivers/usb/gadget/function/f_eem.c index d58bfc32be9e..8741fd740174 100644 --- 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. -- 2.20.1