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); -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html