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ieee802154: add proper length checks to header creations

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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: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Phoebe Buckheister 2014-03-14 21:24:04 +01:00 committed by David S. Miller
parent a13061ec04
commit d1d7358e9f
3 changed files with 5 additions and 2 deletions
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2
net/ieee802154/6lowpan_rtnl.c
View File

@ -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,

2
net/ieee802154/dgram.c
View File

@ -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;
}

3
net/mac802154/wpan.c
View File

@ -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;
}