If nlh->nlmsg_len is less than ND_IFINDEX_LEN we end up trying to memcpy
a negative size. I also re-ordered slighty the condition to make it
more uniform.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/staging/gdm72xx/netlink_k.c b/drivers/staging/gdm72xx/netlink_k.c
index cf0b47c..4089b17 100644
--- a/drivers/staging/gdm72xx/netlink_k.c
+++ b/drivers/staging/gdm72xx/netlink_k.c
@@ -55,7 +55,8 @@ static void netlink_rcv_cb(struct sk_buff *skb)
if (skb->len >= NLMSG_HDRLEN) {
nlh = (struct nlmsghdr *)skb->data;
- if (skb->len < nlh->nlmsg_len ||
+ if (nlh->nlmsg_len < ND_IFINDEX_LEN ||
+ nlh->nlmsg_len > skb->len ||
nlh->nlmsg_len > ND_MAX_MSG_LEN) {
netdev_err(skb->dev, "Invalid length (%d,%d)\n",
skb->len, nlh->nlmsg_len);
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