[IPSEC]: Use the correct ip_local_out function

From: Herbert Xu
Date: Tue May 20 2008 - 05:25:55 EST

On Wed, May 14, 2008 at 10:19:57AM +0200, Marco Berizzi wrote:
> I hope this helps.

OK found the problem, it was my fault after all :)

Dave, this patch needs to go into stable too.

[IPSEC]: Use the correct ip_local_out function

Because the IPsec output function xfrm_output_resume does its
own dst_output call it should always call __ip_local_output
instead of ip_local_output as the latter may invoke dst_output
directly. Otherwise the return values from nf_hook and dst_output
may clash as they both use the value 1 but for different purposes.

When that clash occurs this can cause a packet to be used after
it has been freed which usually leads to a crash. Because the
offending value is only returned from dst_output with qdiscs
such as HTB, this bug is normally not visible.

Thanks to Marco Berizzi for his perseverance in tracking this

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 92f90ae..df41026 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -160,7 +160,7 @@ static struct dst_ops ipv4_dst_ops = {
.negative_advice = ipv4_negative_advice,
.link_failure = ipv4_link_failure,
.update_pmtu = ip_rt_update_pmtu,
- .local_out = ip_local_out,
+ .local_out = __ip_local_out,
.entry_size = sizeof(struct rtable),
.entries = ATOMIC_INIT(0),
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 12bba08..849b78a 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -109,7 +109,7 @@ static struct dst_ops ip6_dst_ops_template = {
.negative_advice = ip6_negative_advice,
.link_failure = ip6_link_failure,
.update_pmtu = ip6_rt_update_pmtu,
- .local_out = ip6_local_out,
+ .local_out = __ip6_local_out,
.entry_size = sizeof(struct rt6_info),
.entries = ATOMIC_INIT(0),
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