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authorArnaldo Carvalho de Melo <acme@redhat.com>2009-09-11 11:35:22 -0700
committerDavid S. Miller <davem@davemloft.net>2009-09-11 12:54:23 -0700
commitffcfb8db540ff879c2a85bf7e404954281443414 (patch)
tree9b0014cd056c4283e6df924a5fe28ab54542c1d3 /net/appletalk
parent8ba69ba6a324b13e1190fc31e41954d190fd4f1d (diff)
downloadvexpress-lsk-ffcfb8db540ff879c2a85bf7e404954281443414.tar.gz
Subject: [PATCH] appletalk: Fix skb leak when ipddp interface is not loaded
And also do a better job of returning proper NET_{RX,XMIT}_ values. Based on a patch and suggestions by Mark Smith. This fixes CVE-2009-2903 Reported-by: Mark Smith <lk-netdev@lk-netdev.nosense.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/appletalk')
-rw-r--r--net/appletalk/aarp.c16
-rw-r--r--net/appletalk/ddp.c47
2 files changed, 35 insertions, 28 deletions
diff --git a/net/appletalk/aarp.c b/net/appletalk/aarp.c
index 89f99d3beb6..9d4adfd2275 100644
--- a/net/appletalk/aarp.c
+++ b/net/appletalk/aarp.c
@@ -599,7 +599,7 @@ int aarp_send_ddp(struct net_device *dev, struct sk_buff *skb,
/* Non ELAP we cannot do. */
if (dev->type != ARPHRD_ETHER)
- return -1;
+ goto free_it;
skb->dev = dev;
skb->protocol = htons(ETH_P_ATALK);
@@ -634,7 +634,7 @@ int aarp_send_ddp(struct net_device *dev, struct sk_buff *skb,
if (!a) {
/* Whoops slipped... good job it's an unreliable protocol 8) */
write_unlock_bh(&aarp_lock);
- return -1;
+ goto free_it;
}
/* Set up the queue */
@@ -663,15 +663,21 @@ out_unlock:
write_unlock_bh(&aarp_lock);
/* Tell the ddp layer we have taken over for this frame. */
- return 0;
+ goto sent;
sendit:
if (skb->sk)
skb->priority = skb->sk->sk_priority;
- dev_queue_xmit(skb);
+ if (dev_queue_xmit(skb))
+ goto drop;
sent:
- return 1;
+ return NET_XMIT_SUCCESS;
+free_it:
+ kfree_skb(skb);
+drop:
+ return NET_XMIT_DROP;
}
+EXPORT_SYMBOL(aarp_send_ddp);
/*
* An entry in the aarp unresolved queue has become resolved. Send
diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 0d42d5da50a..4a6ff2ba4d0 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1270,8 +1270,10 @@ static int handle_ip_over_ddp(struct sk_buff *skb)
struct net_device_stats *stats;
/* This needs to be able to handle ipddp"N" devices */
- if (!dev)
- return -ENODEV;
+ if (!dev) {
+ kfree_skb(skb);
+ return NET_RX_DROP;
+ }
skb->protocol = htons(ETH_P_IP);
skb_pull(skb, 13);
@@ -1281,8 +1283,7 @@ static int handle_ip_over_ddp(struct sk_buff *skb)
stats = netdev_priv(dev);
stats->rx_packets++;
stats->rx_bytes += skb->len + 13;
- netif_rx(skb); /* Send the SKB up to a higher place. */
- return 0;
+ return netif_rx(skb); /* Send the SKB up to a higher place. */
}
#else
/* make it easy for gcc to optimize this test out, i.e. kill the code */
@@ -1290,9 +1291,8 @@ static int handle_ip_over_ddp(struct sk_buff *skb)
#define handle_ip_over_ddp(skb) 0
#endif
-static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
- struct ddpehdr *ddp, __u16 len_hops,
- int origlen)
+static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
+ struct ddpehdr *ddp, __u16 len_hops, int origlen)
{
struct atalk_route *rt;
struct atalk_addr ta;
@@ -1359,8 +1359,6 @@ static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
/* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
kfree_skb(skb);
- if (!nskb)
- goto out;
skb = nskb;
} else
skb = skb_unshare(skb, GFP_ATOMIC);
@@ -1369,12 +1367,16 @@ static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
* If the buffer didn't vanish into the lack of space bitbucket we can
* send it.
*/
- if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1)
- goto free_it;
-out:
- return;
+ if (skb == NULL)
+ goto drop;
+
+ if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)
+ return NET_RX_DROP;
+ return NET_XMIT_SUCCESS;
free_it:
kfree_skb(skb);
+drop:
+ return NET_RX_DROP;
}
/**
@@ -1448,8 +1450,7 @@ static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
/* Not ours, so we route the packet via the correct
* AppleTalk iface
*/
- atalk_route_packet(skb, dev, ddp, len_hops, origlen);
- return NET_RX_SUCCESS;
+ return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
}
/* if IP over DDP is not selected this code will be optimized out */
@@ -1655,10 +1656,10 @@ static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
if (skb2) {
loopback = 1;
SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
- if (aarp_send_ddp(dev, skb2,
- &usat->sat_addr, NULL) == -1)
- kfree_skb(skb2);
- /* else queued/sent above in the aarp queue */
+ /*
+ * If it fails it is queued/sent above in the aarp queue
+ */
+ aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);
}
}
@@ -1688,9 +1689,10 @@ static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
usat = &gsat;
}
- if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1)
- kfree_skb(skb);
- /* else queued/sent above in the aarp queue */
+ /*
+ * If it fails it is queued/sent above in the aarp queue
+ */
+ aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);
}
SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len);
@@ -1868,7 +1870,6 @@ static struct packet_type ppptalk_packet_type __read_mostly = {
static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
/* Export symbols for use by drivers when AppleTalk is a module */
-EXPORT_SYMBOL(aarp_send_ddp);
EXPORT_SYMBOL(atrtr_get_dev);
EXPORT_SYMBOL(atalk_find_dev_addr);