提交 d1d7358e 编写于 作者: P Phoebe Buckheister 提交者: David S. Miller

ieee802154: add proper length checks to header creations

Have mac802154 header_ops.create fail with -EMSGSIZE if the length
passed will be too large to fit a frame. Since 6lowpan will ensure that
no packet payload will be too large, pass a length of 0 there. 802.15.4
dgram sockets will also return -EMSGSIZE on payloads larger than the
device MTU instead of -EINVAL.
Signed-off-by: NPhoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 a13061ec
......@@ -141,7 +141,7 @@ static int lowpan_header_create(struct sk_buff *skb,
}
return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
type, (void *)&da, (void *)&sa, skb->len);
type, (void *)&da, (void *)&sa, 0);
}
static int lowpan_give_skb_to_devices(struct sk_buff *skb,
......
......@@ -233,7 +233,7 @@ static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
if (size > mtu) {
pr_debug("size = %Zu, mtu = %u\n", size, mtu);
err = -EINVAL;
err = -EMSGSIZE;
goto out_dev;
}
......
......@@ -150,6 +150,9 @@ static int mac802154_header_create(struct sk_buff *skb,
skb_reset_mac_header(skb);
skb->mac_len = hlen;
if (hlen + len + 2 > dev->mtu)
return -EMSGSIZE;
return hlen;
}
......
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