check for skb->len in gdm_lte_emulate_arp
Signed-off-by: Andrii Vladyka <tulup@xxxxxxx>
---
drivers/staging/gdm724x/gdm_lte.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/staging/gdm724x/gdm_lte.c b/drivers/staging/gdm724x/gdm_lte.c
index 9ab6ce2..42fcf9b 100644
--- a/drivers/staging/gdm724x/gdm_lte.c
+++ b/drivers/staging/gdm724x/gdm_lte.c
@@ -27,6 +27,7 @@
#include <linux/icmpv6.h>
#include <linux/uaccess.h>
#include <net/ndisc.h>
+#include <uapi/asm-generic/errno.h>
#include "gdm_lte.h"
#include "netlink_k.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));
--
2.7.4
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