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authorPhoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>2014-03-17 18:30:19 +0100
committerDavid S. Miller <davem@davemloft.net>2014-03-18 15:59:25 -0400
commit8cfad496c4257441710735ccef622f3829870164 (patch)
treee5574aa1fac1cac858f94fffb571516bc35809dc /net/ieee802154
parent3c5dfeff932224d3c97cee9fd0d1e2876d700ad3 (diff)
ieee802154: properly unshare skbs in ieee802154 *_rcv functions
ieee802154 sockets do not properly unshare received skbs, which leads to panics (at least) when they are used in conjunction with 6lowpan, so run skb_share_check on received skbs. 6lowpan also contains a use-after-free, which is trivially fixed by replacing the inlined skb_share_check with the explicit call. Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de> Tested-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ieee802154')
-rw-r--r--net/ieee802154/6lowpan_rtnl.c29
-rw-r--r--net/ieee802154/dgram.c4
-rw-r--r--net/ieee802154/raw.c4
3 files changed, 21 insertions, 16 deletions
diff --git a/net/ieee802154/6lowpan_rtnl.c b/net/ieee802154/6lowpan_rtnl.c
index 606039442a59..0f5a69ed746d 100644
--- a/net/ieee802154/6lowpan_rtnl.c
+++ b/net/ieee802154/6lowpan_rtnl.c
@@ -447,10 +447,13 @@ static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
- struct sk_buff *local_skb;
struct ieee802154_hdr hdr;
int ret;
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (!skb)
+ goto drop;
+
if (!netif_running(dev))
goto drop_skb;
@@ -460,42 +463,36 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
goto drop_skb;
- local_skb = skb_clone(skb, GFP_ATOMIC);
- if (!local_skb)
- goto drop_skb;
-
- kfree_skb(skb);
-
/* check that it's our buffer */
if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
- local_skb->protocol = htons(ETH_P_IPV6);
- local_skb->pkt_type = PACKET_HOST;
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->pkt_type = PACKET_HOST;
/* Pull off the 1-byte of 6lowpan header. */
- skb_pull(local_skb, 1);
+ skb_pull(skb, 1);
- ret = lowpan_give_skb_to_devices(local_skb, NULL);
+ ret = lowpan_give_skb_to_devices(skb, NULL);
if (ret == NET_RX_DROP)
goto drop;
} else {
switch (skb->data[0] & 0xe0) {
case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
- ret = process_data(local_skb, &hdr);
+ ret = process_data(skb, &hdr);
if (ret == NET_RX_DROP)
goto drop;
break;
case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
- ret = lowpan_frag_rcv(local_skb, LOWPAN_DISPATCH_FRAG1);
+ ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1);
if (ret == 1) {
- ret = process_data(local_skb, &hdr);
+ ret = process_data(skb, &hdr);
if (ret == NET_RX_DROP)
goto drop;
}
break;
case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
- ret = lowpan_frag_rcv(local_skb, LOWPAN_DISPATCH_FRAGN);
+ ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN);
if (ret == 1) {
- ret = process_data(local_skb, &hdr);
+ ret = process_data(skb, &hdr);
if (ret == NET_RX_DROP)
goto drop;
}
diff --git a/net/ieee802154/dgram.c b/net/ieee802154/dgram.c
index 4c47154041b0..6d251a35bdc4 100644
--- a/net/ieee802154/dgram.c
+++ b/net/ieee802154/dgram.c
@@ -329,6 +329,10 @@ out:
static int dgram_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (!skb)
+ return NET_RX_DROP;
+
if (sock_queue_rcv_skb(sk, skb) < 0) {
kfree_skb(skb);
return NET_RX_DROP;
diff --git a/net/ieee802154/raw.c b/net/ieee802154/raw.c
index e5258cf6773b..74d54fae33d7 100644
--- a/net/ieee802154/raw.c
+++ b/net/ieee802154/raw.c
@@ -213,6 +213,10 @@ out:
static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (!skb)
+ return NET_RX_DROP;
+
if (sock_queue_rcv_skb(sk, skb) < 0) {
kfree_skb(skb);
return NET_RX_DROP;

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