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authorPhoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>2014-03-14 21:24:04 +0100
committerDavid S. Miller <davem@davemloft.net>2014-03-14 22:15:26 -0400
commitd1d7358e9f032a43bd48d56a623943b7bee7dce0 (patch)
tree9e132ac257c7f520382d7082e34ab3f5f1cc9452 /net
parenta13061ec04e9168625427a591235b167d5499bc6 (diff)
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: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ieee802154/6lowpan_rtnl.c2
-rw-r--r--net/ieee802154/dgram.c2
-rw-r--r--net/mac802154/wpan.c3
3 files changed, 5 insertions, 2 deletions
diff --git a/net/ieee802154/6lowpan_rtnl.c b/net/ieee802154/6lowpan_rtnl.c
index d4edd20dab5f..606039442a59 100644
--- a/net/ieee802154/6lowpan_rtnl.c
+++ b/net/ieee802154/6lowpan_rtnl.c
@@ -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,
diff --git a/net/ieee802154/dgram.c b/net/ieee802154/dgram.c
index 55f2dc45a7dc..4c47154041b0 100644
--- a/net/ieee802154/dgram.c
+++ b/net/ieee802154/dgram.c
@@ -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;
}
diff --git a/net/mac802154/wpan.c b/net/mac802154/wpan.c
index b61426662867..80cbee1a2f56 100644
--- a/net/mac802154/wpan.c
+++ b/net/mac802154/wpan.c
@@ -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;
}