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vxlan: Fix double free of skb.

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In case of error vxlan_xmit_one() can free already freed skb.
Also fixes memory leak of dst-entry.

Fixes: acbf74a763 ("vxlan: Refactor vxlan driver to make use
of the common UDP tunnel functions").

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2014-12-23 16:20:36 -08:00 committed by David S. Miller
parent 997e068ebc
commit 74f47278cb
1 changed files with 24 additions and 10 deletions
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34
drivers/net/vxlan.c
View File

@ -1579,8 +1579,10 @@ static int vxlan6_xmit_skb(struct vxlan_sock *vs,
bool udp_sum = !udp_get_no_check6_tx(vs->sock->sk);
skb = udp_tunnel_handle_offloads(skb, udp_sum);
if (IS_ERR(skb))
return -EINVAL;
if (IS_ERR(skb)) {
err = -EINVAL;
goto err;
}
skb_scrub_packet(skb, xnet);
@ -1590,12 +1592,16 @@ static int vxlan6_xmit_skb(struct vxlan_sock *vs,
/* Need space for new headers (invalidates iph ptr) */
err = skb_cow_head(skb, min_headroom);
if (unlikely(err))
return err;
if (unlikely(err)) {
kfree_skb(skb);
goto err;
}
skb = vlan_hwaccel_push_inside(skb);
if (WARN_ON(!skb))
return -ENOMEM;
if (WARN_ON(!skb)) {
err = -ENOMEM;
goto err;
}
vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
vxh->vx_flags = htonl(VXLAN_FLAGS);
@ -1606,6 +1612,9 @@ static int vxlan6_xmit_skb(struct vxlan_sock *vs,
udp_tunnel6_xmit_skb(vs->sock, dst, skb, dev, saddr, daddr, prio,
ttl, src_port, dst_port);
return 0;
err:
dst_release(dst);
return err;
}
#endif
@ -1621,7 +1630,7 @@ int vxlan_xmit_skb(struct vxlan_sock *vs,
skb = udp_tunnel_handle_offloads(skb, udp_sum);
if (IS_ERR(skb))
return -EINVAL;
return PTR_ERR(skb);
min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
+ VXLAN_HLEN + sizeof(struct iphdr)
@ -1629,8 +1638,10 @@ int vxlan_xmit_skb(struct vxlan_sock *vs,
/* Need space for new headers (invalidates iph ptr) */
err = skb_cow_head(skb, min_headroom);
if (unlikely(err))
if (unlikely(err)) {
kfree_skb(skb);
return err;
}
skb = vlan_hwaccel_push_inside(skb);
if (WARN_ON(!skb))
@ -1776,9 +1787,12 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
tos, ttl, df, src_port, dst_port,
htonl(vni << 8),
!net_eq(vxlan->net, dev_net(vxlan->dev)));
if (err < 0)
if (err < 0) {
/* skb is already freed. */
skb = NULL;
goto rt_tx_error;
}
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
#if IS_ENABLED(CONFIG_IPV6)
} else {