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Diffstat (limited to 'net/ipv6/raw.c')
-rw-r--r--net/ipv6/raw.c29
1 files changed, 20 insertions, 9 deletions
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 413d98bf24f4..5e0efd3954e9 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -651,8 +651,6 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
skb->priority = sk->sk_priority;
skb->mark = sk->sk_mark;
skb->tstamp = sockc->transmit_time;
- skb_dst_set(skb, &rt->dst);
- *dstp = NULL;
skb_put(skb, length);
skb_reset_network_header(skb);
@@ -665,8 +663,14 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
skb->transport_header = skb->network_header;
err = memcpy_from_msg(iph, msg, length);
- if (err)
- goto error_fault;
+ if (err) {
+ err = -EFAULT;
+ kfree_skb(skb);
+ goto error;
+ }
+
+ skb_dst_set(skb, &rt->dst);
+ *dstp = NULL;
/* if egress device is enslaved to an L3 master device pass the
* skb to its handler for processing
@@ -675,21 +679,28 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
if (unlikely(!skb))
return 0;
+ /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
+ * in the error path. Since skb has been freed, the dst could
+ * have been queued for deletion.
+ */
+ rcu_read_lock();
IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
NULL, rt->dst.dev, dst_output);
if (err > 0)
err = net_xmit_errno(err);
- if (err)
- goto error;
+ if (err) {
+ IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
+ rcu_read_unlock();
+ goto error_check;
+ }
+ rcu_read_unlock();
out:
return 0;
-error_fault:
- err = -EFAULT;
- kfree_skb(skb);
error:
IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
+error_check:
if (err == -ENOBUFS && !np->recverr)
err = 0;
return err;