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staging: gdm724x: check for skb->len in gdm_lte_emulate_arp 

check for skb->len in gdm_lte_emulate_arp in gdm724x driver

Signed-off-by: Andrii Vladyka <tulup@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrii Vladyka 2017-10-18 16:23:44 +03:00 committed by Greg Kroah-Hartman
parent 3de1abef24
commit d67dc3a402
1 changed files with 5 additions and 0 deletions
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5
drivers/staging/gdm724x/gdm_lte.c
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@ -26,6 +26,7 @@
#include <linux/icmp.h>
#include <linux/icmpv6.h>
#include <linux/uaccess.h>
#include <linux/errno.h>
#include <net/ndisc.h>
#include "gdm_lte.h"
@ -118,6 +119,10 @@ static int gdm_lte_emulate_arp(struct sk_buff *skb_in, u32 nic_type)
void *mac_header_data;
u32 mac_header_len;
/* Check for skb->len, discard if empty */
if (skb_in->len == 0)
return -ENODATA;
/* Format the mac header so that it can be put to skb */
if (ntohs(((struct ethhdr *)skb_in->data)->h_proto) == ETH_P_8021Q) {
memcpy(&vlan_eth, skb_in->data, sizeof(struct vlan_ethhdr));